Here is my newest creation, i practiced on creating believable materials, good positioning and that ‘advertisement’-effect :D(may be a bit overcomposited, but anyways)
Time: 1day
Textures in GIMP
Rendered in Blender Renderer
thanks to leonnn for a lot of feedback during creation
other suggestions: turn on AO (it doesnt seem to be on here) it sometimes does an image a lot of good, and use an area light to make the shadows a bit softer.