The rivers aren't all that bad. I think they get a bit thick too early. The problem seems to be that the terrain is one giant high land with very steep drop off to the sea so all the water is being drained vertically. This might be an accurate reflection of some islands but most would have a rim of lowlands where the river would cut through them. All in all its a great map tho and if your new to this stuff then its a fine start.
For me it's the scale of the rivers...they look really wide, when thinking about the scale. Maybe try thinner rivers with more squiggliness.
If the radiance of a thousand suns was to burst at once into the sky, that would be like the splendor of the Mighty One...I am become Death, the Shatterer of worlds.
-J. Robert Oppenheimer (father of the atom bomb) alluding to The Bhagavad Gita (Chapter 11, Verse 32)
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I love the parchment background!