It may not be worth adding the dotting detail to the apple because you're working on such a small scale. A single pixel is large on the small image and will probably just read as noise. You could attempt it by making them very subtle, meaning reducing the contrast of the spots.
It looks more like an orange than an apple right now-mostly because of the shape. Look at that reference Seiseki posted; you can see how the apple's widest point is just above the center and it is most narrow at the bottom. The base of your apple doesn't exist. It's not just a circle like you've depicted.
As for the texture, your first image was the closest to a smooth look, but the colors weren't blending very well. Try a similar style of shading like you did in the first with the colors of your most recent edit. If you want it to look less like an orange, maybe add more red to your colors. They're currently orange/ red-orange, but based on the reference it's actually closer to a red-magenta than orange.
