Thanks very much for the critique so far. I will rework the rivers, but I can barely find (and I am trying) any rivers matching the 'angle issue'. However I know the rivers seem to dry up randomly.

I'll try to solve the problem by flipping the image, maybe I'll notice more mistakes then. Also I will experiment with the mountains (maybe I'll get them to a nicer look).

Do you have any suggestions how to get a more realistic setup of rives. If you could just draw a few lines over my map I would be very thankfull - if not, I'll still try to fix it myself

Cheers,
Griph