I had medium submalar cheek implants done about four weeks ago and while I see an improvement, as the swelling dissolved they are not as large as I would have liked. On the other hand I do not know how much bigger would yield a "chipmunk" or unnatural look. Would a size large be modestly or significantly bigger? At what point after the initial surgery can an implant exchange be done and what kind of healing can be expected? I am attaching a photo for reference. Thank you!