2nd real pixel art... i think i'm pretty good for a newbie.. =]
there are a lot of stuff yet to learn. dont use dithering for anything thats not aplying a texture, dont use the line tool or any other Shape tool from Paint(or at least, avoid them as much as posible). and try to get some basic tutorials about shading and color picking. as soon as you start to nail the most basic concepts its just a matter of time untill your skill improve.
Special.. I like it! : )
this don't remeber me a space car/ship or other,u can drecrease the shadings and make one better lineart =)