in what area is critique to be sought?
First of all, is this shot well taken in terms of colours

what one hopes to achieve with the piece of work?
Aiming for shooting sunsets like this but with somebody in front (for example, somebody posing for me in front of the railings). I can see even the railings are a bit dark. If I have to use flash, I have to move closer as the flash's range is not that far. Also, I cannot take the whole scene behind the subject.

under what circumstance is the picture taken?
f5.0 ; 1/300 ; ISO 100