So far, with your UV, it gives something like that :
About the modelisation, it has too much definition in the uper part for my taste x)
But apart that, the rest is fine for me.
About the UV unwrapping, well there is more work to do on it.
You should use a checker texture first as material, to see wich part need more unwrapping.
(By example, if you don't see the checker on some part, it means you missed the unwrapping there )
Other thing, you should separate the UV instead of superimpose all of them.
But you can superimpose UV using the same 'coloring'.
To get at the end something like this :
So yes, try to practice some UV tutorials before going farther x)