>>47313749White could use work, looks too clean for a mountain range, mess it up a little, simulate winding mountain valleys.
Orange could be removed, border placed at the river, a good geographical landmark for it.
Same with blue, would look nicer if pushed up to the river
Red is an eyesore, could do with getting pushed north up to the lower height bracket OR
Purple can be pushed down to, again, the river south of it, in which case orange would stay the same as rn.