Grimrock

I have been searching the web without answer.
I am playing Legend of Grimrock 2 on mac X.10 and want to use my own portraits. I made them using all requirements, they should be ok. The question is: where should I place them ? The game folder is pretty simple, there is no portrait folder. I have pasted my pictures everywhere without being able to see them ingame. Please let me know how I can do :/

- switch to column mode
- scroll left until you see a folder named "Almost Human"
- follow this folder until you see the "Portraits" folder
- move your portrait files there

Thank you very much for answering.
I switched to column view but there is nothing more (see screenshot). There is this portrait folder but it only contains GR1 portraits. Placing my custom portraits there does not make them appear in the game (they are 128x128 and .tga)
If you have more ideas please share :/

I said:
scroll left until you see a folder named "Almost Human"

OMG thank you so much !
^_^