well, the point is that if your photo would look like this, then I would say - work on your exposure ;-)
Kidding aside - yes, when lit from behind, then you could get some sort of glowing - the point is, on a photograph this object still would fit in place, would look like it belongs there. In case of your rendering it looks like the cherry has a different lighting. It simply looks out of place in my eyes. It almost looks like a 2D billboard, no sense of depth.
If you manage to keep the glow AND make it look like it belongs there, then you made it. Until then I would say - great rendering, but the cherry looks wrong.
Thats the reason why I said that its often hard to work with white blossoms.
Probably some sort of AO pass on the cherry would help to bring back the depth.