Please, take this as a friendly advice: don't be shy in your modeling. It's seams that you're trying too hard on this part of the model.
In my experience it is best to get the rough 3D form quickly (as a kind of sketch). Then you can refine it.
This kind of process will be faster than trying to get it *perfect* on the first run. It's not that I want you to rush your work, but there's not much to comment on when the shape is not complete. Anyway, you'll be iterating through your mesh even if you don't want to (I know I always do). I don't want to be mean. Your model does look like your concept and I don't see any bad things to point out. But it's just that there's not much there either.
tl;dr: you have a good concept, keep moving and don't get stuck with getting things perfect.
I'll be watching your progress!
EDIT: added proper english