Lighting is another thing to be amazed with. I, actually, tried to achieve a similar lighting style to convey a certain nostalgic mood, and trust me it wasn't easy at all.
Now, imagine coming up with a new way to light a portrait when everyone does it completely differently - that is what separates a genius from the rest.
Yousuf Karsh is my favourite photographer hands down. The idea of using blue sensitive film for Hemingway's photo itself deserves the highest praise - what would be a better way to emphasise subject's personality in this case.
And going back to the original topic of what is outside of the comfort zone...
That would be nude or semi-nude stuff for me - I just have no idea how to do it, or how to make an attempt in doing it, or where to draw a line between the fact of nudeness and art.
I am curious, but I am too afraid of making mistakes going that way - I don't want my peers to say, "now you went completely pervy."
Ahh, the old nude fear! That is on my list as well and yep it comes down to what is not pervy and what is. I actually thought about this a little while ago and even nearly came to the conclusion that I would probably be more at ease doing out and out porn then an artistic nude, simply because with porn you know EXACTLY what you are trying to achieve....the artistic nude, yes, where is the boarder line between what is art and what is not?