Agent X - minimal concept

My friend and I trying to make an indie game some time soon, and yeah, i'll be de graph man for this, i neither know why. It'll be funny, and a total new experience ^_^ 

So this was my first try, to create a 2D sprite for side-scroll game (i draw some top-view earlier, then isometric), so i'm not really familiar with this minimalistic, sideview, so if you have some tutorial or tips 'n' tricks, let me know.

Not really pleased with it (don't know why), but i think it's good, for first try, tell me if you feel this way too. (or other )

Made in: Paint Tool SAI, and GIMP
Time taken: Bout 5 minutes, when i figured out, what i want.