Hi Jammy
No1 - I like the subtle colours, shades and lines.
No is interesting, but you didn't have to go to the states to get a shot like that.
No 3 I think would work better with the interest on the closer lily.
The squirrel focus in not quite on the eye and IMO would have been better if all the animal was in focus.
The sealion is almost there - focus wise. I've tried to shoot these myself and they are difficult to nail.
With you title "my Trip to the USA" I'd have expected something that said America.