There are many good answers by other surgeons to your question, so I will focus my answer specifically on your concerns and the photo that you submitted (which is very helpful).
In my Denver area practice, I believe that the combination of liposuction and fat transfer to the buttocks can provide powerful tools for improving the buttock aesthetics.
I agree that the buttocks are "fine, perky and full," and can see some asymmetry with a somewhat imbalanced shape on the right.
Here are some possible options I would consider:
--Use liposuction to sculpt the small of the back and the upper hips (this significantly impacts the aesthetics of the buttock appearance)
--Contour the right lower hip and upper thigh area with both liposuction and fat transfer (to a shape more like the left)
--Consider rounding off the inner aspect of the buttock crease area with a small amount of liposuction
--Use fat transfer to the buttock for volume and shape enhancement
--Consider liposuction to the lateral thighs at their lower aspect
My friend Dr. Constantino Mendieta in Miami has done great work in helping to define the buttock aesthetics and to share his insights with other surgeons. His website has a lot of information on this topic.
Hope this helps