[*SN RADIOACTIVITY*]

Sorry, this is the first time I have ever redlined something. :S
The drawing is very good and detailed, although there are a few anatomy errors I just wanted to point out. (:

The Head.

Your foal's head seemed fine, the detailing was pretty accurate, though I have a few pointers:-
> On your original drawing, you haven't seemed to have added a chin, or didn't emphasise it enough. The thing should be quite large and pointy, like the one I did. :3
> The cheekbone line needs to be a bit more slanty, as the foal's head is tilted down slightly, the cheekbone will also be slanted.
> The angle of the head means you need the eyes quite high up, as you already have, though to emphasise the angle correctly there should be a 'bump' on top of the eye, not to much but slightly, like I have demonstrated in the circle.
> Because this is a foal, I suggest you make a bit larger and more 'foal-like'.
> The cheek seems to be hanging down too low, because this foal seems more of the warmblood type, you want the face to be nice and defined, and keeping at the tilted angle, like I showed in the redline.
> I made the ears a bit longer, though this may not occur in some breeds of horse, I tend to notice that foals seems to have large ears for their heads, but as they grow into a horse, their head also grows making it all evened out.

The Neck, Shoulders & Chest.

The neck, in terms of thickness is accurate, and the muscle linings you done were just about spot on.
A few tips:-
> When I draw I think scientifically about the pose, and visualises a horse making the same pose. I then judge whether the horse will be balanced, or is it just going to tip forward/backwards? In this case your horse will tip forwards. So I then ask myself how a horse will change to adjust to the pose and keep balanced. In this case the front leg you drew will come forward slightly and the right outer front leg will come forwards, to balance the front half of the horse. Since the foal's neck and head are quite forward, the outer leg cannot get behind the inner leg you drawn, or the foal will lose balance. If you are about to capture it doing a transition, like from halt to walk etc. then the leg can go behind the inner one because the horse will be taking a step forwards, meaning it will not be in that position for long. I assumed the foal is stationary, so I drew the outer leg in front of the inner one. Because of the way a horse's body works, this means the outer side of the chest will be visible, including the lining of the outer shoulders. The line in the middle of the two fore legs is where the two layers of fat and muscle ends, and the skin dips in. Because of the pose now, the inner shoulder is pulled back a bit, to line up with the inner front leg.
> Where your foal's armpit line is, it doesn't point in, it points and curves out slightly, though right at the top there is a bit where it goes in where the bone is, though that isn't that visible because the leg is straight.
> The neck you drew on the foal seemed to me a bit short, so I lengthened it a bit so the withers can lead to a nice smooth, curved back.

The Legs.

Your leg drawing is very good, much better than me when I first started! The one thing I always struggled with is getting the joint in the right place, but you seemed to have gotten it fine!
Pointers:-

> To me the hooves looked too small, the hooves tend to spread out a bit so the horse can evenly balance on them. (Again I visualise this on a real horse.)
> The fore leg seems to be a bit too thin, so I chunkied them up a bit. Though if you were aiming for a Thoroughbred like horse, my example may be a bit too thick, I am used to drawing cob-like horses. x3
> The hind legs stick outwards too much, just bring them in slightly. My hind legs don't look too good to me, as I have also come out of an art-block, but I hope you get the gist. :3
> Just make sure you emphasise the knee joints a bit more, if you look at a horse irl, you would notice that their knee joints are quite large, and it is quite easy to tell where they are. :3

The Back, Stomach and Hind Quarters.

This seems to be, to me, where the majority of your errors are. (: Though it is a good try, it is clear that you have emphasised where the back leads onto the rump and how the legs connects to it.

> The back needs to be curved in slightly, if you look at pictures of horses, or actually studying horses, you will notice that their backs aren't a straight line, that they curve slightly inwards. Sometimes some horses have more of a curve than others, depending on the age and breed of the horse.
> The rump seems to be a bit short lengthways. Try to spread it out so that it leads smoothly into the back. Because this is a foal, the rump will be larger upwards than another horse because they are still growing.
> The tail is a bit too high up on the rump, I made mine lower down, just above that point on the rump. I also made the tale flow downwards, though if you was going for a windy surrounding, you can leave the tail and maybe adjust the mane so it is pointing the same way as the tail to show it is windy.

Overall, this is a really good attempt, and I really like how you used the lines and circles. It is really good while learning, it helps you with the anatomy. If you keep practising like that and using plenty of shapes to help, pretty soon you will be able to draw without relying on them so much! (Though most people choose to rely on them because it makes it easier, I only ever use shapes when I am really struggling on a pose. ;3)

I hope this helps, and if you have any questions just ask me! (:

~SN.

[Mario]

Ooh!

[*SN RADIOACTIVITY*]

Haha X3 I didn't realise how much I wrote, it felt like writing an essay or something. 0.o
A fun essay, of course!

[Mario]

BAHAHA.

[OneRowdyNight]

Omgarrrr. <3333 I LOVE YOU. SO MUCH. 8D THANK YOUUU.

[*SN RADIOACTIVITY*]

No problem! I am glad to have helped! 8D