Read a few comments that say V+F or V&F, what are they? what is their meaning?
Voted and Favourited.
From reading the 3rd comment. This is a 500px notation/abbreviation, not a photography term.
Nice pics, BTW.
V+F or V/F or V&F is just "Voted Favorited" which means, of course, that your picture was voted and favorited by the user :)