If it's for an exhibition...
I'd choose the old man.
Why?
Because it's the one I'd look at the longest.
It's a fantastic and feel good shot.
Shot 1. Great shot. Thought provoking.
I'd look at that and think... "I wonder wtf he's thinking and what he's so worried about?"
However, My eye wanders to the left door frame that's not straight...
Good? Bad? Inconcequetial? No Idea, it's totally subjective and just me thinking that it might have been a border to the pic... feel free to correct me if I"m wrong or on the wrong track... It's just what I'm thinking
Shot 2: The old gentleman. Wow this is a cracker of a shot.
Great expression, just makes me feel good looking at it... Starts me thinking what's going on? Is he leaving? Where are they going? Man he looks happy!
Just a great feeling coming from this pic... again all subjective
Pic 3: Ice 1. Too much going on here for me.
I look at it and my eyes wander quickly and then focus on the OOF part jutting out at the front.
Personally I'd move on.
Pic 4: Good shot of the ice... interesting patterns on the ice crystals. If you were going to choose out of the ice crystals, I'd personally choose this shot.
Pic 5: Great shot, nice lighting and nice shadows.
Pic 6: Doesn't do it for me. There are 3 major points of interest in this photo. My eyes wander from one to the other, the bridge, the building and that stack on the left. Because I can't see the top of it, makes the image almost feel incomplete. (subjective again from me
)
Pic 7: Good pic. Nice composition. However if I saw it in an exhibition. I'd think "nice pic... nice composition..." then move to the next one. Nothing that really draws me into it.
IMHO, I'd choose no 2