I have two major problems that i found. With the fakemon their shading is off. Remember to pick a spot where the light source is and have the brighter shades closer to it. One sprite in particular has a light color on it's stomach. That should be replaced with a darker shade. And i noticed that the reindeer have skinny legs and they're in an awkward position.
Oh I see...Hmm. I think that your linework is pretty good, except for a few cases where you used the Line tool just a little too much. The main problem is your shading. In the larger pieces, there needs to be more shading, and instead of cross-pixelling you just need to use more shades. It makes the piece look better overall - and besides, there's no color limits when you're making the sprite for fun, so you don't need to cross-pixel at all if you don't want to.
There are species of reindeer which has short necks :\The reindeer looks weird because it doesn't really have a neck. If you brought the head up and allowed for a neck then you would have room to make the legs look more leg like. Right now they look like arms rather than legs. On animals like reindeer the legs have a smoother transition and tend to be "attached" at the bottom of the body.
