I 've started on the photoshop course, it's been really helpful so far!
I see what you mean about the tangents, thank you for pointing that out! I sized her down and moved her over a bit, I think it works a little better now. I also took a swing at coloring, I colorized my black tones to a warm brown just so it wasn't too dark and dreary. Then on a normal layer added some color. I think I understand what you mean with the fourth method, I'll definitely check out Dziernacki's stuff and see if it would work better for me.
As for her eyes- she's actually a robot, which I think the color makes more apparent. But I get what you're saying about the glow! And yes, this is part of a larger narrative. I'm actually trying to develop a better background style for my webcomic, so I think I'm going to do some snapshots of scenery to get an idea of what I want to go for. If you see more things to be improved, I would love to hear it! I really appreciate what you've said so far, you've been a huge help!