in regards to 'otherworldly' that is fine. I meant on the ones that look earthen. Blue sky green grass green trees snowcapped mountains brown dirt etc.
Another thing that came to mind was the layers of rock. Some of the areas of your planets look like they had geological changes over the years. Some look like static.
Id rather see stuff that looked more layered. Gives the planet history, anyone with any basic geology knowledge would understand. If it is all mixed up it looks like it was just dumped there from an explosion. Since we dont have volcanoes and comets yet.. a more layered setup for your dirt/rocks would not only make cliffs look better but caves.
Also, caves. Caves are too much. They need to be toned down greatly imo. It shouldnt be possible to get totally lost in every cave. The cave system in boundless looks like bread up close. Too many holes and passages. There should be cave networks, but there should also be areas without. just an opinion.