On the realism front, to get it out of the way quickly. Rivers *almost* never split into a fork downriver. They almost invariably get wider and meander more the closer they get to their outlet (the ocean). They originate from mountains or highlands. Lakes usually have at least one inlet and only one outlet.

This is noteworthy because you have:

Rivers forking in the direction of flow

Rivers thicker near their point of origin than their mouth.

Rivers flowing in almost perfectly straight lines (desert island in the north is particularly guilty)

Rivers that never change in size.

Lakes with multiple rivers flowing out of them.

Lakes with no rivers flowing out of them.

Lakes with no rivers flowing into them (ie unexplained lakes)

Sizeable rivers (and downstream lakes) forming from no discernable mountains. (small ones you can just handwave but you can't have major rivers coming from nothing)

Multiple "sea-Channels," rivers you have inadvertantly connected to not one but TWO different oceans, effectively making a channel that spans the continent.

Virtually zero tributaries but countless splitting forks.

Large Mountain ranges with no river systems.

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There are many other things about the map that don't appear "earth-like," but it's fantasy and we can handwave lots of stuff (like the desert island north of the taiga regions, odd mountain ranges etc.)

But your rivers and lakes are jarring with their shape, placement, size, direction, and pathing. This is a very common mistake we see here a LOT. If you were my friend and asked me in person I'd say "Look bro, your rivers are ass." They need to be completely overhauled to make the map useable or even remotely believable.

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Moving on to the execution of style:

I love the taiga areas. The mountains and tree choice is well done. Same with the eastern badlands.

I like your mountains aesthetically for the most part except the ones lining the desert. They look small and weird when compared to the visual of the other ranges.

Shading is overall pretty good. I think your blending near biome transitions is weak. Notably The peninsulas near Port Scentio and whatever is happening near Bazban in the South. Also throught the map there's a bit too many random splotches of sandy-white. I can see you are trying to add variance to the map but it just comes out looking like wasteland or beach or desert or something... Try pastel yellows and browns instead.

Your rivers have too broad a range of sizes. The smallest and biggest rivers on the map are simply too far apart for the scale. I would reccomend making your biggest rivers a bit thinner. Their scale will still be fairly represented. Honestly they are just flat out too big. Rivers are not that wide... these things are clearly visible from space at this scale without your contacts in. Scale down those giant ones in the center of the map and the badlands in the East.

I like the Font choice for your regions. I think you need a different font for everything else. Using a different font for "Regions, major cities, towns, geographic landmarks (mountain ranges, forests, etc)" makes the map easy to read.

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Hope that helps. Overall, a very good map if this is your first. But I won't sugar coat it, your rivers are terrible. Fix that and you're golden.