No particular order but these are the most common mistakes i see daily:
submitted to the wrong cat
wrong description (doesn't fit the site or same as the site title)
not enough nudity
not enough content in the niche (i.e. blowjobs - 5 of 20 pics is not enough)
pics in incorrect order (she isn't half dressed, then , nude, then fully dressed, then nude again)
recip to a non existent LL
small full size pics
full size pics too large (over 80k)
full size pics poor quality
finally probably the biggest noob mistake using over exposed sponsor content
I could go on and on but I'll let others add theirs
