Realistic Expectations for a BBL

I'm 5'9" 125 lbs. I'm fit but do not like my rear end. I came across this photo on a doctor's website and am curious if it's realistic for someone of my height and weight to have a butt like this: 

Realistic Expectations for a BBL, submitted image.

JenniferSNY

F, 38, New York

Just from looking at the picture, I would venture to guess that this is a woman who is in tremendous physical shape.  However, I have heard that BBLs can yield tremendous results.  I looked on the web for some before and afters that I thought were superb.  Here are two I found:

Realistic Expectations for a BBL, submitted image.   Realistic Expectations for a BBL, submitted image.

 

Realistic Expectations for a BBL, submitted image.   Realistic Expectations for a BBL, submitted image.