I finally came to the conclusion that Doflamingo has one eye or something is wrong with his left eye.
Oda keeps showing Doflamingo eyes like something is there we should take notice of, Doflamingo always wearing glasses, or cloth wrapped over his eye, but then Oda revealed Dofla right eye but close up. I came to 3 conclusions
1- Doflmaingo has a eye problem where his eyes is weak to light, this explain why he wore sunglasses all the time even when he was a kid.2- something is wrong with Doflmaingo left eye or he's missing his left eye. I came to this conclusion with Dofla Jolly Roger which has it's left eye crossed out.
! [qimg]http://img1.wikia.nocookie.net/__cb20130809014011/onepiece/images/archive/f/f5/20130809014231!Donquixote_Pirates'_Jolly_Roger.png[/qimg]
3- it may be nothing, just me overthinking cuz I'm bored.
Could be fun if he lost it in the window incident.