I do not do a lot of people shots but if and when I do I much prefer candid. I am no good at posing people or things. I assume the colour is a result of the tint on the overhead glass. I don’t mind it but I find the two subjects are too far apart. My eye keeps getting drawn to the brightest par t of the iamge i.e. the centre and I want to keep looking at the tree structure in the background. I think if you had been able to change the angle to get these two closer and a wider aperture to blur the background it might be slightly stronger.