Thanks so much Lem00n, it's great to know you're enjoying Void Dreaming and the cast! A gallery is definitely planned eventually; I want to wait until I have a full UI update ready to go before I start messing with those things. Rest assured that a gallery and more are going to be hopefully added in future updates!
As for a guide to getting them, I heartily recommend the Void Dreaming discord! There's lots of fans there happy to help!