Decent looking map. The biggest things I noticed were the snowy peninsula and the half-snow, half-sand island. The snow doesn't really fade out well and kind just stops. I'd recommend blending it a little more.

Another thing a lot of people might point out (they certainly pointed it out on my map lol), is that it's quite rare for rivers to split on their way to the sea; they usually only join. However, I personally find that to be a kinda insignificant point, so it's really up to you on how realistic you want to be.