i think if you want to make it believable, you need to put time into making parts look suitably complicated and functional, for example, here's the rotor of an apache: there's a lot of stuff going on there! attention to detail will sell your model
In my personal opinion this seems to be too thin and flat on the sides Let me show a few examples http://www.cbc.ca/gfx/images/news/photos/2008/08/07/ch47-chinook-cp-2502593.jpg http://www.cbc.ca/gfx/images/news/photos/2008/08/07/ch47-chinook-cp-2502593.jpg…