He is referring to the screenshot aspect ratio - how squished and dragged out they are from side to side
Also, are wings static? As in, thjey got animation to them or not? If not, I'd make a suggestion on making them Kerrigan-like, as in no have that spread out, but have them behind the back, rather so spread out. Just my 2 cents. other than that, awesome!
PS. I am not a modder, but are those wings a replacement for gear? or just placed on character model? Would you consider making other styled wings, aka for priests, paladin etc.