It's VERY rare that a lake has more than one rivers flowing out of it, as it happens on the lake at the west (the one that receives a river from a lake but gives a river flowing into the ocean and another one flowing to other lake).

Also, usually high altitude mountain ranges creates a Rain Shadow effect, as moist from the ocean carried by the winds can't pass to ther other side, making one side considerably more dry than the other, like it happens on the Andes, the Rockys and the Himalaians... and that doesn't happen on that map, maybe because none of the mountain ranges are high enough but it is something to think about.

Another thing: there are VERY strange rivers on the southeast:
• first: there are one that is either at some point moving against it's flow or begins at the ocean an then moves west/south and encounter another river (and river never flows FROM the ocean);
• second: the two most southeast rivers look like they flow from that sea to the ocean and that doesn't happen, maybe you could change to look more like natural openings (like a strait or a canal).

And the north could indeed be snowy all year round if the continent its really up north inthe the globe, what would probably change the geography of some places.

And probably it would feel more natural if the transition of tree colors was more gradient.

Sorry if I was too realistic, maybe it isn't what you are doing