Welcome to the forum! Don't feel too bad if your art doesn't get many replies. I've been on a million different art forums over the years, and there are only two types of art that get people talking: amazing artwork and god-awful artwork. Because of your lack of replies, you can rest assured that your artwork is somewhere in the middle, so you're doing pretty good for a beginner. =)
For your monk, his pose isn't very convincing. With his legs so far apart, his balance from front to back is very stable, but his balance from side to side must be awful. He'd fall over if you pushed him on the shoulder, and he'd have a very hard time moving quickly during a fight while he's doing a half-split, hahah. Bring his legs closer together, and get him in a crouching sort of position or something. Look up some real kung-fu experts for reference, and copy a few of those pictures until you get the stance right. The mountains are okay, but why is the sky green?
And what art program are you using? I'd suggest Graphics Gale or Pro Motion for pixel art. They each have their strengths and weaknesses, so maybe both? Open Canvas and Paint Tool Sai are my two favorite painting programs, if you want to give painting a shot, too. (You should, it'll help your pixel art as well!)
Just remember to always use references, and you'll learn quickly. As you get better at drawing, you'll need them less and less.