Pallette Edited, also there is more detail on the crater, i'm gonna edit again depending on what are the impressions on the rock texture 

If you want to improve the rocks, you'll have to consult someone much more skilled than I am. They look great to me!

Thank you :) your help is incredibly helpful, what do you think about the "non angular" rocks? do these look ok or should I try to make whole rocky stuff angular?

I really like the angular rock texture. Delightfully silly concept. How do you come up with these?

As for how to make it better; maybe the pink and red clash? The pink areas are nice so I would try changing the red parts to a different hue; maybe a cooler one. Blue or grey? Not sure. Some AA and detail in the hole at the top might help, too.