Nice start! Welcome to the Guild - we're glad you're willing to contribute from the start.

My wild impression of the mountains/ foothills is that on this world all mountains are made of steel, and are surrounded by belts of rust in which nothing will grow ;-). Not that it's easy to depict some elevations with vegetation and some bare, but that's the way mountains ARE, ja?

The rivers all make sense, though they and the coast are a teensy bit pixelated. Did you get an idea working on this one whether your computer can handle a bigger/ higher resolution canvas?