Here is a screen capture of my Bob character with his arm and leg.
I have taken the approach of including a few realistic details in to the model, like the shape of the forearm, and making the knee and pec areas more pronounced. I've done this because I think having these structures - particularly the knee and pec - adds a bit more detail which stretch when they move, and prevent ugly distortion.
Always follow the musculature of the body! This is the key rule I bear in mind. You can bend it, of course; characters come in all kinds of sizes. However if it''s meant to be believed to be human, it needs to work like a human!
I look forward to getting more done to show up. The complicated areas are what lie ahead.
I also have a fun challenge planned for myself. I will divulge more information when I complete this task.