great drawings, think this is my first time seeing good fanart that isn't 5cm long xD
i can kinda see your problem with the heads though:
IMO, with your Elesis picture, I think there may be too much empty space on the face (the eyes and mouth might be too spaced out i think?)
there's something wrong with Ryan but I'm not sure, maybe his head is too small or it's something with his neck...
Sieghart's head is too wide
but overall great drawings, i especially liked your Lire and Lass drawings