I've started a new project building a lemming (from a very funny German comic series). However, I'm not quite sure how to proceed. I've got the head and body foam parts done but now I'm kind of hesitant because I don't have a pattern for my custom head and body fleece. Since this is the first time that I'm not using a project puppet pattern it is kind of hard to understand how to do that.
Here is a picture of the head. I used the Roly pattern for the head but I made it bigger.


Also, I think I need to put more foam on the back so that it's going to be a more rounded structure. Or do you think that it's not necessary?
Here's what I'm going for:

Thanks for your help!