I am not sure if this is a limitation with the software or not, but the mountains at the top seem to be spaced too far out compared to the others. Rather than looking like a chain of mountains, they look like a lot of individual mountains. Perhaps do these like the closely grouped ones on the southern continent?

The text also appears to be pixelated... I am not sure what you can do to fix this tough...

I like the glow on the oceans, but perhaps the colors should be reversed? The dark blue in the center where the water would be deeper and the light blue on the outside nearer the shore?

Looking forward to more...