Yep. Ponies as deer. I think I'm actually the first person to do this? I've seen ponies as humans, dragons, dogs, cats, real horses, their pets, and I believe I once saw a pic of them as hippos. But in my two years of bronyhood I've never seen any of the cast converted into deer.
Just something fun I thought I'd do to help with my obsession with deer lately. I thought a pic like this would look better in a more painterly style, and I told myself not to spend more than three days on this, so I just kept the thing sort of sloppy and used Hubble space pics to finish the background more quickly. (I snuck a certain nebula in the bg, as a joke if you can find it. ;D ) I also had fun looking up different species and such to make these mostly accurate, so here are some things about each conversion:
Nightmare Moon: Pretty standard doe with armor here. I gave her antlers because I thought it made her look more royal and god-like. A few female deer actually have antlers (but mostly it's a genetic fluke. Only Caribou females have antlers as the norm), so I'll just roll with it. Deer don't have manes either, but NMM just wouldn't be NMM without the cloud of stars she trails.
Chrissie: It was difficult combining cervine and insect, but after I gave her multi-branched antlers, I thought of the Shishigami from Princess Mononoke, and went with making her more like the Asian Giant Hornet (my thought process is all over the place). Antkers don't usually grow like this, but when they do it looks pretty awesome: [link]
The massive antlers work to give her a sort of crown from which her hair falls like a veil.
Sombra: Not much to say here. Instead of regular antlers, I have him single branch, curved antlers like a Gazelle (which, like antlers on does, is possible in many species). One is broken, however, to give a sense of the many battles he's been in.
Discord: The most fun to work on. Since Discord already has several deer-like properties, I decided to make him resemble a deer's predator instead. He walks on all fours, with a body more bulky like a lion, but silent and graceful like a wolf. It also explains the creepy predator look he's got going on.
After I had that figured out, I just went wild stylizing everything and replaced his deer antler with that of a moose because reasons.
Fun fact: I was going to nix the fangs on everyone originally, but then I found out some deer actually have them. Specifically the Chinese Water Deer and the Muntjac (one of which I shall own someday): [link] [link]