Just an FYI, these are about the same size as you see them here, as in if you click the image to enlarge it what you'd see would be larger-than-life.
Things that would be changed: The one with in the desert, those yellow lines on the road were a late addition I wish I'd left out. Also, I think these have to be analogous, so that yellow sand is too different a hue. The one with the wispy clouds over the ocean (not the billowy-clouds-over-ocean), the clouds need to stand out more. Though that may be difficult to achieve. I did that one by painting a plain blue sky then adding the wisps with white paint, whereas the usual method is to leave the spaces that are to be white unpainted (which I did with every other painting). But with wispy clouds this is quite tricky, I'd basically have to paint the sky in between each wisp. And the night scene with the full moon is a little bland...
The aforementioned billowy-clouds-over-ocean might be my favourite. I feel comfy with the orange sunset but I'd probably rearrange the cloud formation. I like the crescent-moon scene too, though as-is it's pretty much the billowy-clouds-over-ocean, just with purple.
For tomorrow, the room drawing! REALLY hope I can finish it all tomorrow, but I do have Saturday to work on it as well. Wish me luck!