From an artist's perspective, not much. The shape of the nose is similar, but that's aout where it ends. Villa's is a bit thicker, and more rounded at the tip. Alexi's lips are longer and slightly thinner, with less shape. Villa's eyes are very rounded; Alexi's are a bit flatter, and the corners are lifted. His eyes are just less droopy in general. Alexi's face is also a bit more tapered, and more defined; his cheekbones are more prominent.