"We may all be netted together" - Darwin. This picture is a great way to illustrate and explain the relations/interactions within all animals. Does not necessarily relate to sexual selection, but a good representation of all Darwin theorized of.
Hollyleaf and Leafpool. I love this style of drawing, but *shivers* o.o And who said Warrior Cats was a kid book? I'm trying not to leave this fandom yet. It's holding a special place in MY heart, at least.