If you google any trout or char species, its amazing to see the variety of colors. Those can be especially drastic between different bodies of water and regions. But I'm also always amazed to see the differences within a single body of water.
Here are some pics highlighting varieties within one body of water that I caught on a single day. Some are in spawning colors, some are juvenile and some are mature. A couple of them are showing traits of their cousins the arctic char and lake trout, but I'm pretty sure they're all pure brookies.
1- the colors made me think splake, but the tail is pretty square, and there are not spake or lakers in this water. The fins were mostly white with just a small shade of orange.
2 - spawn colors - caught a lot looking like this.
3 - So much more green than the others I caught. Side by side they look like different subspecies.