Selective color isn't a photography technique, it's a design technique...and I'll leave my opinion on it out of this post because you'll hear the same opinion from most people so there's no need to rehash it. I'm a photographer for fun and a designer for a living, which means this image is right in my wheelhouse to C&C. You masked it very poorly, you can see spots where you went over the edge & surrounding leaves are green, as well as spots where you didn't make it to the edge & the fruit is gray. Did you use a layer mask, or did you just duplicate the layer & make that copy B&W then erase the pieces you wanted to be color? I'm betting on the latter...try using an adjustment layer with a mask. If you need help using an adjustment layer, search for a tutorial on Youtube, it's pretty visual otherwise I'd explain it here. Once you're up to speed on that, you can mask out the fruit, then use the Refine Mask tool to turn on smart radius & find exactly where the edge is, then feather it slightly...smooth out any nastiness, and get a perfect separation between the B&W portions & color portions of your image. And the best part of masking vs. deleting, its not permanent. You can always edit the mask to add or remove more color.