How to fix flared ribs and short shoulder width without painful invasive surgery. (Being realistic here, this will take 1-2 years).
The above pic is an example of a flared rib cage.
The above pic is an example of a short shoulder width.
Example of a good aesthetic shoulder:
Exercises to do to widen shoulders are wide lateral raises and wide push ups.
Good lat muscles and upperback will compensate for your flared rib cage in the front. The goal here is to get a wide upperback (wings).
Exercises to grow wings, Wide chin ups and Wide grip squats
A nice set of strong oblique muscles will greatly compensate for your flared rib cage.
Spider-Man pushups or weighted oblique crunches
Last but not least, the Golden Era Vacuum pose. Overtime, your flared ribs will compress, and this pose will give you good posture over time. It took me a whole year to flatten my stomach with this pose, this is the only abdominal exercise I do. The trick is to breath OUT all your air, then imagine bringing your belly button back towards your spine. Great for relieving stomach bloat, stomach gas and you will look more photogenic in pictures!