Hey that's pretty nice! There's a tad of banding going on (i.e. pixels following the outline too closely, but it's a hard thing to avoid), and the feet seem a bit odd (they look kind of like shoes, but i know how ridiculously hard it is to draw feet), but otherwise you got it nicely. In particular, the head and hands (nice stylized appearance, i always catch myself trying to show ALL THE FINGERS on even the smallest sprites) strike me as very nice, because i always struggle with those (DAMN YOU, HUMAN ANATOMY). Keep going like this and you'll be super good in no time flat!
If that's your first shot at pixel art, then i'm going to go curl up in a corner. My first sprites were... Well, horrible. Not just bad, completely and utterly horrible. Behold, my first idea of a nuke, scaled up so you can see all the horror (psst: it's made 9 months after my very first try, i fortunately have no sprites from back then):
AUGH. What's wrong with it, you say? EVERYTHING. Pillow shading(!!!), banding, excessive amount of colors, badly drawn nuke symbol, bad contrast on between yellow and grey, complete lack of details... Suffice to say it's not a sprite i'm proud of today. I later went on to re-do it:
Well, at least it isn't pillow shaded. The yellow symbol clearly stands out, but is still pretty badly drawn. The sprite is also far too dark, and sorely lacking in contrast. Sure, low contrast gives a smoother look, but it's also much more flat. So, i remade it again:
Oho! It has details! The changed color was more of an experiment than anything, but it looked neat enough. It also has increased contrast, and i abolished that horrible nuke symbol because i couldn't make it look any good. Also, notice how the outline barely changed at all between first and final. A proper outline is important, but so is the content within it. Not that it couldn't be better, i've seen a gagillion spriters able to outdo that with striking ease, but i'm content with it myself.
It took me THREE YEARS to get from the first to the last, because i'm slow like that. :c (but it also goes to show that even an incompetent schlub like me can get almost decent at arting with sufficient practice, so hang in there people)
(parenthesis ramble ramble)