You can also look at fashion tips.

Wear slightly wider shoulder straps if you have wide shoulders.

Don’t get anything that draws your eyes to the shoulders or upper arms.

A belt will also pull you in and make an eye-catching distraction from your shoulders.

Also, try different poses,

Look at genetic girls, they tend to move their arms gracefully whilst men tend to posture and make themselves appear larger

Most importantly, try loads of clothes on and enjoy yourself.