These look good to me. Good job!
I new to pixel art too.. I haven't shared anything here yet, really either..
But if I may, I might suggest shading the clouds in your first pic a bit differently. Something about them seems a little off. And I know you're trying to keep it as minimal as possible, so I'm not sure what I'd suggest doing.
The only image I have a little trouble imagining is the second to last one. It doesn't strike me as an apparent scene, like all the others. Anyway, great job. Have you done any more, or made any adjustments since you posted this?