This is the closest image I could find to visualize Lucas.
Narrowed eyes, that almost hidden smirk, maybe not as dark facial hair, but the face shape and contours are damn close.
Not those clothes. God not those clothes. Lucas wouldn't be caught dead in somthing like that. But the face and hair is pritty dead on IMO. Alex Pettyfer with scruffy hair.
Of course feel free to disregard this if you have something different in your head.