Yo good work man. I love anatomy so this part of the term was a lot of fun for me.
2 quick tips I noticed:
1) Abdominal group always has 10 "squares" in pairs. Make sure to count the 5 groups and try to memorize their position in relation to the bellybutton. Usually 3 groups over the belly button (not a rule but usually), with one group pretty much over the ribs, 2 pairs being very noticeable, and 4 below the bellybutton.
2) There's a back muscle that's noticeable from the front (I forgot the name sorry, I'm a bit rushed right now), it's usually what forms that "V" shape at the side of the torso.
Though it connects under the armpit it's not quite part of the front torso. The torso itself is usually fairly straight, and this muscle is what gives that V shape in buff guys.
All around good work dude. Keep it up!