Self teaching can only get you so far, assistance required.

[SnakeEyes]

Hello, new to the forums. I've been trying to teach myself Solidworks for the past year and a half or so, I've been doing ok but I'm running into something than I cannot figure out. A friend asked me to model a handle he made out of clay. I can make the general body shape but it has a molded thumb groove that I absolutely cant figure out how to model and will take any advice you can give me. These are pics of what I'm trying to make. Thank you for any help in advance.