How big can a butt implant be? (Photo)

 The short answer is, buttock Implants can be custom-made to just about any size. That being said, based upon your photo, a) you will never achieve anything near this with fat transfer and b) it will take you several operations to be able to fit this large of an implant in your body.  Please read on for more details about proper sizing and shape of buttock implants:Typically, a combination of sculpting of the waistline with liposuction and augmenting the buttock with implants provides the best chance for a long lasting and desirable "hour-glass" figure.  However, please keep in mind that a physical exam is always first necessary before providing any final surgical recommendations. Based upon your photos, a Stanton Anatomic shape buttock implant may serve you best.  Make no mistake, it is indisputable that the best position (aka "placement") for buttock implants  is in the intramuscular plane not on top of the muscle and not "sub-fascial" which is exactly the same as on top of the muscle - so please do not be fooled by this terminology. 
Other than placing buttock implants within the gluteus maximus muscle (aka “intramuscular”), the most important factors in creating the perfect derriere with implants is indeed selecting the right size AND shape. I have found the best way to assure this is to simply measure the actual dimensions of the patient’s buttock cheeks. With these anatomical measurements, I can select an implant that not only significantly augments the buttock but also supplies the correct 3-dimensional enhancement to look as real as possible...even in the most petite patients. Traditionally, teardrop oval implants have a 30+% risk of rotation and thus unnaturally change the buttock shape/appearance when doing so.  However, one and a half years ago I created and patented a new "Stanton Anatomic" shaped implant that avoids this issue AND provides as much projection as similar volume (cc's) round implants - I have not had a single rotation problem in 250+ patients. Additionally Stanton Anatomic buttock implants tend to maintain a more natural buttock shape/curve even when bending over - an otherwise not uncommon problem with round implants. This is a huge benefit by the fact that ~90+% of  patients have more of an oval shaped buttock cheek than round, thus creating a much more natural and harmonious buttock contour for the majority of patients. Finally, buttock implants, including Stanton Anatomics, do indeed significantly augment the hips especially by filling in much of the "hip dip". So in summary, the only way for you to know what implant works best is to consult with a board certified plastic surgeon specializing in this procedure and have him/her take your measurements before selecting an implant and proceeding with surgery. Also not a bad idea to select the surgeon who has the most experience, the best reviews, and the most pleasing before and after photos.

Thank you for sharing.   If the implant is too large it can prevent the incision from healing and invite infection.  Choosing the right size implant is crucial to ensure the overall success of your procedure. Be sure to choose a Board Certified Plastic Surgeon that specializes in this procedure and is well known for it

You will have to get both an implant and fat transfer using VASER technology to get the results that you want; The largest transfer I have done is 2100 cc per cheek. 712cc for the implant and over 1300cc of fat. This will provide you the changes that you are desiring.