Oh Nemesis's left pose brought me so much trouble! And let me tell you that I won't design any antlers/horns that I don't have reference in every angle! It's a pain x__X
Shirlight is my own invented species. Species definition is till under the work, but how about I share with you some of the decided details (that might change thou :'D)
Shirlights don't have gender when born. Some of then do develop more male/female characteristic over time but some don't. So even females and genre X will have horns.
Physique is deerish, mixed with horse and possibly dog anatomy/behavior. Shirlight's height (including horns) can differ from 60cm to 1,3 meters. As a side note they can't be breed because every Shirlight is an individual and their appearance isn't tied to genes, but their own mind. Some changes that happen aren't conscious, but for example can become as reaction to trauma.
All Shirlights share few exteriors in common. Most noticeable is their of course their faces that resemble human masks. But those aren't limited in any way with colour, size or shape. Then all have frail and thin legs with small hoof.
Voice resemble close same as birds. It's still unknown what defines what kind of tone/singing/cooing will sound like. Voice is the only thing that stays the same Shirlight's whole life. When born, Shirlight's may stay mute even five years. But some start to communicate almost immediately after born. Their communication is more based on the tone and emotion of voice than actual words.
Here is what I have figured out so far! Since the species is still under development I DO NOT want you to use Shirlight as species for your OC. Unless you are okay with the fact that I might change/add to the definition and will comply without any questions.
Possible fan-art for Nemesis is okay too ^^