From just looking at this picture, you would probably not be competitive in open bodybuilding or even classic with this amount of muscle and structure.
Not in a negative way I agree with @Montego. With that said do not get discouraged. I have done shows for 30 plus years. There are very small local shows that you can find and get your feet wet, but not yet. They only category I can see you entering right now is a small local show in the men's physique category. Most of these shows are broken down by height, weight, age and so on. Again, don't get discouraged. Find out what category you want to compete in. Attend a show and see what your competition looks like, 100% hire a coach and have them guide you through. Good luck brother, it will take some time but you get there.
No need to work your obliques , work your serratus to catch up.
I think he might benefit from going through a prep with a coach. Every prep is a learning experience even if he doesn't place. Getting shredded is a huge shift for the body and it learns.
