I my limited experiences the dominant male gets dark but not the bright flashy breeding colors, although those colors are present, just subdued.
Sometimes the coloration works and a lesser male will flee and sometimes it takes a nip or 2.
With my spec Ampah I have observed 4 different distinct colorations with males.
1. Dominant, dark with some color
2. Normal stripes imitating female coloration
3. a very drab coloration all over not even distinct stripes and not dark, the current loser
4. full bright Mating colors accompanied with dancing and courting a female
No there no photos of all this, if they are not in the mating colors then then are in some level of the social scale. Each species of course is different and imagine that would be a very tough photo prject even because of variation in each species.