How would you cast me if you didn't know me? (And if you don't very well, how would you cast me on first impression?)
Actually, now I think about it, the clean-shaven ones could be fine for serious parts, so I think I'm probably rubbish at judging someone's suitability for a role from a headshot ;)
Oscar Wilde plays, anything with RP really!
You have a lot of gravitas and weight (in terms of personality, not physically!). You can appear quite calm and approachable. Characters which require intelligence and responsibility suit you.
From 4 i would cast you as a clever villian character. Possibly even a hard man love interest.
As you've outlined I your brackets above - I'd agree with those roles.
Serious - moody - intellectual. You could do dark. You can do quirky.
Young father, older brother, cast in TV drams and stage Shakespeare
Just from photos I think you have a relatively broad casting range. In a polar 'fairytale' world you could play either the 'good' or 'bad' guy. Definitely come across as clever and good natured - commerical wise, you could definitely be the smart guy that people would trust. I now you can be very funny and again I think that's something hard to portray in a photo without undermining a certain neutrality that is a necessity. There are very few parts I wouldn't consider you for theatre wise. As we all know for television, film and commerical it more often than not begins with a search for a very specific look that one either conforms to or does not.