Uh-oh, you're gonna get "river" critiques, here...
Although large rivers have deltas at the mouth, these are branches of the main river and generally very short, except for the largest rivers.
In every other case, a river does not fork downstream, ever. Forks occur when rivers from different sources join another river moving downstream. The forks point away from the sea, never forking off and reaching the sea separately.
Other than that, nice map. You should check out GIMP, since you fiddle with Photoshop. Lots of tutorials for both here, however. I can't believe the number of people who map with MS Paint (!?)
Welcome - and don't take my criticism too harshly, just a point of geography...