This is one of my favorite begonias - I love the coral and shell pink combo. I don't know if it's the same but there was a begonia called "Apple Blossom" that looked like this.
What a beautiful shot of a beautiful bloom! One AC nomination, a "fave", and three gold stars. Excellent and well thought out border with just a touch of vignetting. Lovely colors and softly focused. I would have renamed this one "Loving Caress" because the image has its own aura and has touched me unlike most other shots, especially flower shots.
I can see why it's your favorite! Beautiful coral shades complimented by the white and lime greens. I might have to go find some of these beauties. -Christie