Flat looking breasts. How can this be improved? (Photo)

Your implants are under the muscle.
It appears that the left implant has partially herniated out of the pocket
I would not rush to do anything right now .In the future if you decide to change the implants ,you may want to consider placement above the muscle

There are several possible reasons why your breasts may appear flat and boxy after a breast lift and implants:

Swelling: It is common for swelling to persist for several months after surgery, which can make your breasts look flat or boxy.
Implant position: If the implants are too high or too low, or if they are not centered properly, this can lead to an unnatural or boxy appearance.
Implant size or profile: The size and profile of the implants can also affect the shape of your breasts. If the implants are too large for your body, this can make your breasts look overly full and round, or even flat.
Breast tissue: The amount and quality of your breast tissue can also impact the final shape and appearance of your breasts.
It is best to discuss your concerns with your surgeon, who can evaluate your breasts and determine if there is a problem that requires revision surgery. Depending on the cause of the problem, your surgeon may recommend different options, such as adjusting the implant position, changing the implant size or profile, or performing a revision breast lift.

Best of luck !