I'm gonna try to be super simple here and just dump a very recent sketch.
Now, all I have to do is fix that hand and figure out what colors I need to use.. the source of light... etc...
Yeah, I'm freaking out already. XD
Here are some ugly, and I mean really ugly, sketches and stuff. I'm less into the CG painting thing, as I'm more into cartoon-y, animation, semi-simple things. When I'm in the sketch/not-as-confident-in-this-stage, I tend to also suffer from, the "Why do they only have one eye?"-thing, too. I am so aware at how bad these look, especially the one with the two kids and one's standing, his proportions are so, so wrong.
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Hey and welcome to CD! You have some interesting pieces here. Your sense of color is quite strong, particularly in the last picture where you've achieved a cool atmosphere only using a limited palette.
Don't put yourself down so much though! The sketches you posted aren't bad, you just need to approach them with a little more confidence. Sketches tend to look more rigid and constrained when the person is overthinking it; so don't be afraid to loosen up a bit. If you do that then drawing the second eye won't be so daunting anymore either.
Keep it up!