You map is pretty good with nice colours and rough mountain texture. The bit that will strike out is the rivers which might be perfectly intentional for your particular world but could never exist in reality. What you basically need to do if reality is a goal is to think that each drop of water as rain falls into a watershed and travels to the sea along a (very very nearly always) single path.
This issue comes up so frequently that we have a thread about it:
Essential river guidelines for mapping
I know how you feel about spending countless hours on projects but luckily my wife does the same.
Welcome to the guild. Theres a few helpful links in my sig and one is my new Where In The World script which you might want to add your approximate location to.
Oh and ill "Banish your Blue Pip o' Shame" (tm - NeonKnightHoldings Inc used without permission etc etc)