Hi Sadman

You are not alone. The more I read, the more I realise that there is more to read. However, there is nothing to worry about because most people are like that because learning is a never ending process and I do not think anyone can claim to know everything.

This is what my opinion is of your friend's photos.

Normally, there should be a 2.5 cm gap between the spine and each scapula. If you look at the photos again, you will see that the right scapula is closer to the spine than the left. In other words, left scapula is more abducted than the right.

Additionally, the muscles around the right scapula seem to be more active than the left. Look at the right upper trapezius muscle and see how prominent it is.

His shoulders do look internally rotated because the biceps are facing medially. This is a common problem with people who go to the gym because most of us want great pectorals. Have you strength tested infraspinatus on both sides?

Also, look at the distance between his arms and the trunk. Right arm is farther from the trunk than the left which to me looks like his right shoulder is very slightly abducted and that would explain active upper right trapezius on the right side and more shoulder abduction on the right. I would not be surprised if his supraspinatus is active too because this muscle is usually responsible for initial 15 degree of abduction (debatable).

Hope that helps.

Do I have your permission to use your photos for discussions with my colleagues and students?