I only have few things to say and thats modeling from reference images helps a lot, look at murph's, second thing is, I always try to make my model a single piece of geometry, instead of having loads of parts, the third and final thing is welcome to SimplyMaya, hope you enjoy your stay.

just one more thing SimplyMaya have a load of great free tutorials that could help you thru this challenge check them out here

good luck

Dae