I think most often even when there is a desire to be told "oh it's ok" we really do want to know how to improve and therefore suggestions for making improvement next time (if not this time) will most likely be greatly appreciated.
When asked for an opinion, I will give one. And sometimes I will explain why, other times I don't really know why I like A better than B or C. It just fits MY sense of the fitness of things.
If someone wants to know why "this doesn't look right" I will most likely find a way to give options that could make it better. I prefer giving choices if possible particularly if it's a color/fabric issue.