Okay so I have been working on this mouse for weeks now and in particular the top half. I have the base made and it seems to be all good. I have made so many different attempts at the top but all have failed me when trying to thicken etc.

Here is the top of the mouse that I need to model :

I have also attached the project with my last attempt at making the top. I really need to get this done for school so any help advice or anything is appreciated.