Pretty late to the party, but my wife just emailed me the photo. I used a divider to measure how tall Obama and Hillary are compared to the height to the seat of the chair.
Obama = ~4.25 chairs x ~ 17.3” = 73.5” tall (Height of Obama from a google search.)
Hillary = ~ 3.8 chais x 17.3” = 65.7” tall. (Hillary’s bio says she is 66” tall).
So, I think the height issue is mute. (I backed into the 17.3” height of the seat of the chair based on Obama’s bio, but it seems reasonable for a folding chair, but I don’t have one around the house.
The blue gap (with the bars) between Obama and the flag is probably something to do with the construction.
The red in the hay bales seems to form lines and is probably red baling twine and the blotches are where they were tied.
The only possible flaw in your observations is giving Hillary credit for telling the truth about her height in her bio. : )