Well I do like the colors that you are using, nice and subdued.
I don't often pull out my River Police Badge, but you seem to have a problem with your rivers splitting on the way to the Sea. This almost never happens unless there is some unnatural reason. Water goes from high ground (Mountains and Hills) to the low ground (Seas and Oceans). They will join with other flows on the way there, maybe divert around a bit of harder ground (look up Montreal on google maps), but not split like your rivers do at both Ashadome and Rivercross. The reverse would be more likely with those cities at where the feeders join. Try drawing the rivers from the sea and have them split heading towards the sources, they would look much more believable that way. Just keep it balanced.
Another suggestion would be to not pack your trees so tight. The density makes the forests seem way too regular and "unbelievable".
That said, Like I said earlier, I do like where you are going.
***Edit*** As for lightening the parchment, you could always put it below the rest and change the opacity of the layer