I fully agree with the last comment of NedS298. Personnally I find inspiration in Earth shapes (making little parts big continents for example) or past/future earth. It gives immediate "coherence" without being very troubled with all the geologic/realistic questions. I often question myself about the possible complementarity of each continent to redo a pangea (the wegener puzzle), but that's all.

Even though I find that questions interesting by itself. We're far to understand and discover everything about it btw (a common thing in science, and happyly!)

Anyway, I really like what you have so far!