You should receive an email with a guide as to why they were rejected. From recent experience, although I stress I don't know the reason why yours weren't accepted, it's usually because the user hasn't named them correctly, omitted the Scientific name or perhaps not filled in the keywords section.
Can I ask for everyone to please fill the keywords in, lately many of the uploads have had this part missing. I'm currently not rejecting these but it's tiresome having to edit every single upload to correct this. Don't forget to remove the dash between the Common name and the Scientific name as well!

Whilst I'm in moaning mode, also PLEASE put a space between the Common name and the dash! It should look like this:
Southern Hawker - Aeshna cyanea
and the Keyword should look at least like this:
Southern Hawker Aeshna cyanea
Any further words in the keywords should be separated by spaces only, no commas, brackets or any other symbol.
This all may sound petty, but when you've got three screen loads of fiddly little corrections to make every time you go to moderate, these little details build up into a major moan!!
