Background meme

This is a challenge meme.
The goal was to draw 3 kind of sceneries (here; sea, nature, city) at two different moments of the day (6 BG in the end) , the whole thing in 45 minutes.
It's funny to do it with friends and see how different everyone's results are... and cheat by trying to distract the others by telling nonsense over Skype ¬w¬; *is very easy to distract*.
I'm missing one I didn't have time to finish it *ashamed ;_;*.