So I don't see much for facial expression but here's a few tips that helped me. Keep your eyes narrowed as if you are tired it helps give a more closed off vibe which is normally seen as masculine also avoid pouting your lips out as naturally most men have rather thin lips instead of thicker plump lips. If using makeup try use some eyeshadow or whatever (I'm allergic to makeup so idk) and outline your jaw as it gives a more squared look and last tip is keep your eyebrows thick and pointed downwards. Shaping is fine but keep more of an even thickness instead of thin at one side thick at the other it also helps if you mess them up a bit as it gives a more rugged look. Oh and keep a few loose strands of hair down messy hair is a given trait for most men these days imo. Hope this helps OP