wibeke, oh, how I envy your hoofer drawing skills, you're little pokemon is so lovely. <3 I love the pose and movement, and I really like how asymmetric you placed the legs. The lightning looks great to me, it's a nice touch and adds somethhing extra. I would have loved to see the kind of sharp highlights things get in the light of lightning though, with lots of contrasts and deep shadows^^. I'm impressed by your people drawing skills too, he looks pretty neat^^.
Marmoset,
I've redlined it for you, but please keep in mind that I don't draw horses so I might have gotten everything wrong. I googled images of sitting horses and there was two major things I found a little off in your drawing. Mainly, the body should be a little more barrel shaped, and rounded. Second, sitting horses rest much of their weight on their butt rather than sit on their heels that dogs do, you can see it in most photos of sitting horses, the butt is in the ground and the feet are mainly used for balance. Another thing you should watch out for is the placement of the knee, the hind leg of your horse appears to have two kneecaps. The leg should be pretty much straight from the knee to the heel, so don't make a lump on the leg there^^. Other than that it's really nice and it's a unusual pose that's tricky to draw.