oh, definitely! that is a really good way to go about it, mainly when it comes to muscles. However, I will say with how fat rests, you should keep in mind that there are so many different ways that fat can sit on the body. Muscles are the same, but since fat is a much more amorphous solid than muscle is, it tends to have more variance. It also can depend on the person because people collect fat in different places (for example, fat collects at my thighs on me, but on my grandmother it collects at her tummy, on my mom it collects at the hips and lower tummy, and a few friends of mine have it where it naturally collects at the chest but not much of anywhere else). I have some tumblr pages of body type/anatomy references saved to my browser if you want me to send them to you!