I don't know until with stage u can manage Maya.....
But in my opinion your model has too many unnecessary faces.....
U can start to delete some of them....
In the end u will find more easier to manage......
In my case I took most of the time when I mold moving dot by dot........so less dot to move means less job to do......
anyway,your model for a first shape is good......quite big for a ninja......but keep working......I interesting in what kind of ninja u goin to create......