Would a Cheek Implant Be Suitable for Fixing Asymmetry? (photo)

I would try fillers first as a very minor operation vs a cheek implant as a more involved operation. Also fat grafting might be a nice in between procedure to think about. 

Correcting Cheek Asymmetry
Without an exam or additional photos at different angles it is difficult to tell. However, from the one photo you provided, I think that a modest increased volume of your deficient cheek would be of benefit to restoring a more symmetric appearance. Cheek implants are permanent and predictable.  Fat Grafting (fat transfer) is also permanent but less predictable. Fat grafting is done by lipoinjection but not all of the transferred fat lives. Either method can improve your appearance.   You will have to weigh Fillers vs Fat Grafting or using an implant.

Pro: Fat Transfer by lipoinjection is more of a permanent solution as is use of an implant.                                 
    Con: Because the amount of fat that survives is variable you may need to do additional treatments. Further as the fat transferred behaves like fat from the donor site, if you gain a lot of weight the fat transfer will also increase with volume. Implants are foreign bodies and rarely can become infected or dislodged.

Pro: Fillers: such as Radiesse, Jeuvederm, Restylane, Perlane, Sculptra and others can give you an idea of your improvement and if you are unhappy with it, it will dissipate over time.  On the other hand, if you like what you see, then you may want to go ahead with fat transfer of placement of an implant.

A unilateral cheek implant can certainly be inserted on the hypoplastic or weak side to augment and match the opposing cheek area.  Cheek implants come in different sizes and shapes depending upon whether the implant is malar, submalar, or a combination.  A consultation with a physical examination is the best way to address these issues since this is an operation based on millimeters.  A cheek implant is a permanent solution to the asymmetry in the cheeks and is often used when patients have an old cheekbone fracture or just a congenital asymmetry on one side.