Sketching [3/4/13]

Recently, I've gotten a big desire to sketch things, and so I've brought it out as a hobby. I wanted to get some opinions on my first few sketches. I'm not trained, I've never taken a class, and I just am doing this for fun, so please don't judge too harshly! Below are 3 pictures. Two are of the eyes I drew today. (I had to learn with a tutorial, then expanded it myself.) Then there is an original of Earth with a shuttle flying away from the Moon at a distance. Sorry for the bad quality!

If you want me to draw something, I'd love to try something new. I want to push my limits!

That's really good. Heh the directional eye that you showed me, that seems familiar................................................I mean what

Great you want to sketch stuff, most of the times is really fun and result can be anything, the eye was fantastic and the space shuttle was hilarous (for me)

Good stuff

That's pretty amazing! Especially because you don't take a class.
As for a suggestion I think you should draw a marble blast level. Probably not really what your looking for, but I think it'd be cool to see.