Wait, so I think I misunderstood your original request.
You just want to make a more "realistic" recoloring of segments of the product?
Why not just do that with Hue & Saturation after selecting the area?
So here you can just make a selection of the area you want to edit.
Add a Hue & Saturation Adjustment layer.
Then at the top where it says "Master" as the pull down menu, change it to a color nearest to the product surface color you want to change. In this case, I chose "Yellows" because that's closest to the tan leather color.
Using the eye dropper on the far left, sample the color of the area you want to change. This aligns the hue value more accurately for changing it from the source.
Now slide the Hue value to a new color, adjust saturation and brightness to preference.
Any areas that you don't want changed, or need to clean up. Just paint black into the mask of the Hue & Saturation adjustment layer and clean up. But it looks more realistic that way. And, it's way easier.
is that what you're looking for?
