I like that style! Has the potential to be pretty awesome looking. I agree, the river is... meh. That deep bevel could probably be scaled back a bit, and it could use some more zigs and zags; your mountains are fairly detailed, while the river seems very simplistic in comparison. Also, is there a reason it takes that abrupt western turn when the ocean is right there? Rivers generally seek the path of least resistance as they flow from higher to lower elevations, and unless you've got some unmarked mountains between the coast and the river, it makes more sense for the river to empty pretty much straight south into the ocean.