"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.
I have an obsession with eyes. I do believe that they are the windows to the soul. I draw eyes in a lot of my notebooks and on almost all of my school work. I find them so. I hope you like this awesome pic of a lot of this colorful eye :)