Changes Maggy's hair: Her hair is more straight now, with a single noticeable curl. This also affects all of her body spritesheets so that her hair remains consistent throughout all animations.
Changes the Character Select Screen: Maggy's image there has her new hairstyle. Also, Azazel now smiles instead of scowling, and Lazarus is more :| instead of outright sad. I dunno, just made those changes while I was in there.
Changes Maggy's Boss Vs screen and floor transition images to match her new hairstyle.

This mod is basically finalized; I have no plans to update it. Additionally, it's included in my larger mod collection which is not on this site yet due to my laziness and the sheer size of the thing. You can find my mods at the following link until I upload them all on this site. http://www.reddit.com/r/themoddingofisaac/comments/2zf8nf/doomzeros_visual_improvement_mods_v19_and_up/

Standard installation instructions. The zip archive contains a "gfx" folder; just place that in C:\Program Files (x86)\Steam\SteamApps\common\The Binding of Isaac Rebirth\resources and you're good to go.