I agree with Achilles about the outlines. x) Work on getting them to be smoother, and following a more consistent line. You also forgot the two dots for a nose, and generally the bulbasaur eye has a more shaped iris, like humans do, which touches both the bottom and the top of the eye. Example:

Spoiler:


Nevertheless, you did a great job. x) You could try giving the treetops a little more shape, rather than being flat at the bottom, but that's all experimentation!


~SF.