Three things: 1. You may want to post this in the Hacks and fangames forum, rather than the Super Metroid one. 2. These rooms do look good as a start. 3. In both rooms, I see a lot of broken slopes. After every triangular BTS (green triangles), you need a square BTS behind it.
You should avoid being repetitive with your visual tiles, or the place will look fake and unnatural. Be varied in rocky and/or organic environments, as well as destroyed areas.