This was when I was starting my model. I made the arms, legs, body and head as separate objects. 

For the shoulders I tried different methods such as extruding it from the arm. I also stitched the legs to the body. 

I also tried extruding it from the body. 

But I went with making a separate object and stitching it to the body. 

I then stitched the arm to the shoulder.

I also made fingers and stitched them to the arm. 

I made the backpack and stitched it to the head. 

I then fixed the shape of the pipe. 

I started making the face with a plane. 

I then stitched the face on the rest of the head. I also made a transparent glass with a separate plane. 

My final model.