Good try, but this looks fresh out of a 1980's game. You could improve on the drawing style, so it's not just face on and there's some depth etc.
The background isn't too imaginative either, the blue is okay but the grass is too... wierd. Tone down the contrast, use more natural colours and just don't copy and paste patterns like you did.
Also, did you blow it up? I should really be able to see the individual pixels this easily, are you sure you were using pencil on 1pt?
But no, good first try, keep working at it and spend time on everything, you can't pixel without patience. A good pixel should take hours, if not days to complete, don't try to cut corners because it's cheating