Very simple job; I've got 7 images of a serving tray on a white background. The only thing needed to do is to give the tray a more shiny finish, as if it has a transparent, glossy coating. No need to change color or something, just give the impression of a smooth and shiny coating. I have included a sample image of the tray and an image of what the finish should look like.
Secondly the edges of the tray are not super-smooth, they need to be slightly rounded off and retouched where necessary.