I uploaded the reference in high resolution, so you can see the details!
1-Could you please check the knee areas, it’s the hardest part for me!
2-I worked on the Quadriceps leg muscles and tried to show a hint of the teardrop muscle and the Sartorius Muscle!
3-I also tried to show Serratus Muscle, but it confused me! I wasn’t sure if it wraps upward like the obliques’ muscle lines or downward (the lines of it that wrap on the rib cage).
Lastly, why the clavicle /collar bone on this man doesn’t make an S line curve like the bicycle handlebars?