One major thing that'll make or break a good photoshop job is the use of shadows. This involved two different layers. I had one layer, set to multiply at 100% that I used a dark green, soft brush with the opacity of the brush set between 20-30% for the lighter shadows. Then, I created a layer set to normal with a soft dark green brush with varying opacities to get darker shadows. This is how it looks without the frog:

Note that I didn't get rid of everything around the leaf since it's being hidden by the frog. Same goes for the areas of raspberry that I didn't clone away from the background.

Now, with the frog back, the final image looks like this: