Need some help with color change, I use Pixlr. Need critique and pric8ng based off this piece, but I plan on making lots more. Mane/tail help would be awesome too, just got into drawing them.

Looks nice! Do you have DeviantArt? If so, search up mane/tail & Color change tutorials on there. If not, I'd happily send a link to a few.

For the hair, I would use a pointy edged brush that is fairly dmall for more realism as well. Then use a few different colors possibly, and try to ad a lightly effect that goes alon with the coat.

Use more tints and shades, as well as making your brush softer, and adding tiny little wisps to the mane and tail.

Also the leg shadows must always be touching the leg, unlike on the back legs of the image you posted above.