well you clearly can "art", so its a matter of refining your technique.
As Seiseki said, there are a lot of "brushy" strokes, that could help provide texture to the scene, since its such a small image, you wanna use all you can.
there are a few double pixels here and there that make my eye twitch a little, but again, thats a matter of cleaning up your drawing.
Keep at it! you'll get better and better