Okay my lovely Tigerstar, let me help you out here! :)
Here is a Friesian example of a Blood Bay:
meepAnd this is the reference that I use sometimes whenever I do a Blood Bay:
MeepIt would be best to always look up a photo of the type of coat or marking you are trying to make to get an idea of what to do. Blood Bay's, in my opinion, take some different shading to do, instead of just a plain 1 color of red. It's also more of a darken color between brown and red.
Now, here's a perfect example of a Blood Bay with Khim Fire, made by the wonderful jes:
bleepKhim and Paint Fire have different styles depending on the artist, like
this one and
this oneAny Khim marking is also a lighter or darker version of the base coat.
Now Fog is a scary mark to make, trust me, some of the artist are scared of it. xD
Neri made a lovely post explaining on how fogs works and how it's supposed to look like:
Fog Markings, I would suggest reading that so you can make the fog look better.
Also, the genes for each are:
Blood Bay ~ Ee | Aa
Khim Fire ~ +Fire
Khim Fog ~ Kfkf
So it would be like:
Genes: Ee | Aa | Kfkf +Fire