This is pretty darn cool! I love the water effect. That was a good idea.
I think with how far mars is, the greenlands would be very low, and the highlands would start accumulating heavy snow and water, which seasonally be melting off into the oceans, creating a continual water cycle.
While I like the water effect, being super unique, it's not realistic, as where is it coming from? Showing the glacial highlands forming with the water may make it seem more plausible.
The stars could use some work too. Maybe a faint milky way. To note I also shared a generator you could fiddle with in photoshop:
https://planetside.co.uk/forums/index.php/topic,629.msg254801.html#msg254801 (Also shared a legacy version later in that thread too)
Just my idea though. I really like this. Quality of the planet looks good.