just some small tips:
- do a studio set-up like LazyVirus suggested; best loot at blendswap for something (I recall there is one there, not sure)
- use an HDRI environment map for world lighting (google hdri haven, he has some freebies you can use) and some reflections
- use a grunge map for very subtle amounts of roughness once you add the gloss (put the texture into the mix factor of gloss and diffuse); you can start with a noise texture and tweak it with a colour ramp for starters - this will give you the fingertips you see that break up the gloss once someone touched a book
- arrange some subtle spot lights around your scene and give it some variation (check 3-point lighting tutorials on youtube)
- add some compositing (e.g. depth of field, vignette, …)
you will see that it changes the perception of the image immediately. Also, if you think you lack the realism in a product visualisation set-up (it is a bit artificial) you can model a modern metal book stand and put it on
P.S.: On the UVs: you can change the UV layout in the UV Image editor while in edit mode on the object - if the Unwrap squeezed your UV islands you can bring them back into straight form with axis scaling - this way some of your issues might be solved.