Yes, I have an account there by the name of (you guessed it) Eltain. I've never posted anything though; just looking at their work and reading their walk-throughs and examples and such have left very insecure about the whole ordeal.
I did however learn how to use GIMP from a very simple tutorial, if you'd like a link? (GIMP 2.9, free to download. Somewhere in the Map thread on these forums dachs or someone provided a link.
That being said, the only thing that jumps to mind regarding your map is, what happens if you flip it upside down? Not what you're looking for, but it adds new perspective. What if that massive asian continent were more similar in climate to Africa? And Kelks a barren Scandinavian-russo steppe?
I'm tired however, if you make more clear what you were wondering about? Coast-line, future potential for cultures, what?