A Muck Head

[Chris2Balls [:B]]

I would suggest working on a background that's not black, white, grey or a pure (100% saturated) colour: this will help you give a setting for your sprite. Generally, I'd aim for a colour that's an opposite to the colour you're working on (blue/orange, red/green, yellow/purple), so that the sprite stands out.
I like the green palette for now, but what more can you define on the sprite? Is it a kind of insect? Think about structure, think about texture. Here's an edit:

Anyway, keep at it!