Those lakes aren't draining right. You never, ever have a river that runs the entire length of the land, topography just doesn't work that way. The drop shadow is backwards, too, so it looks like the sea is higher than the land.
Other than that the only criticism I have is that the land looks too squarish. You've got some great shapes on the left and up top, but I'd open up that landlocked sea in the south to the ocean proper because otherwise it just looks kinda weird. Vary the shape a bit more in the southeast. I'd personally chop a huge chunk of the land off there, maybe have a trailing peninsula or archipelago on the right, but it's your map so you're the only one who knows what it's supposed to look like.
You're off to a great start, you just need to get a better sense of topography.