Welcome aboard
Chapps!
To make the candy hearts that I made here:
1. create your desired heart shape on a separate layer
2. load selection & fill with desired colour on a new layer (leave selection on - do not deselect at any point until finished)
3. select/modify/feather (I feathered 3 pixels)
4. Ctrl/Shift+"I" (invert) and delete 3 times to "feather" the edges
5. Ctrl/Shift+"I" (invert back) and contract 4 pixels
6. fill selection with a shade lighter than you original heart and deselect.
What this does is create a definable edge.
Now you can multiple this "heart" in the normal way to create a 3D look.

Any questions, feel free to ask!