1) Regarding that you said they were "browned out", it may be because she is wearing armor. Mages of any sort have their spells shown, but aren't able to be cast unless they are wearing nothing or robes.
2) If you put them in the portrait folder, you have to use Custom Portrait in order to add it to a newly created party member. For an NPCC like Imoen, you might want to use a program like Shadow Keeper to go in, and change her portrait.
3) The closest thing I can think of off the top of my head is in the back of the manual, where there is a list of single-classes and how much HP they gain, as well as the constitution bonus. It should be noted, however, that very quickly in SoA, your characters will only begin to receive 1, 2, or 3 HP max. This is for game balance and not a bug, so don't worry.
4) WELCOME TO IRONWORKS!!!
-Brainless One
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