I don't think I can get them all, it starts to get blurry when I zoom in too much. But -
Hamlet's the dude in black talking to the skull. Othello is...well, the black dude. The old guy at the bottom who's still got his energy and looks like he's whipping up a tempest is Prospero (from The Tempest), while the old guy on his left, cowering with a court jester type of little fellow, is King Lear.
Upper left corner, the guy with the big sword and dark hair is Richard III. Under him the toga-clad gentleman with the knife is most likely Brutus from Julius Caesar.The three witches standing around a cauldron are from Macbeth.
There are two women in balconies, and I can't place the one in the middle with the red hair, but the one on the far right is Juliet (the rose gives it away). To Juliet's left, Shylock the Merchant of Venice is hanging out. Oh, and in the upper right corner the guy dropping off the baby is Antigonus from The Winter's Tale (get it? winter?) He is most famous as the unfortunate gentleman who must "exit, pursued by a bear." Which then eats him.
That's about all I can t get with high enough confidence. There's probably some sort of fairy / Midsummer Night's Dream reference up at the very top, and is the big fat guy supposed to be Falstaff?
That was fun, I hope somebody else can fill in the blanks.