Yeah, the continent in the upper right has several lakes with multiple outlets, that doesn't happen. Try fractalizing the path of the longer rivers, they seem a little too smooth. The only concern I have about the mountains is in the center surrounding the Lake/ Inland Sea. It seems like you go from the highest peaks on the planet to a sheer drop to the coast. The coast edge seems a little hard to me, but I always feel that way about my maps and am not always successful in fixing that. Pretty good for a first map.