Mood Board / Inspirations

Okay so a few things I would love some feedback/discussion on.

The backstory: I am currently doing a Blood Angels fell to chaos during 30k army to play as DG. I plan on doing a cool Sanguinius conversion to show off but also want to get some units so I can play it as a chaos united army for jump packs but that is a story for another day.

A big theme in the design of my army is going to be a separation of the nobles and lower caste. Basically first born noble vampires and their turned thralls.

I want to do a kind of pagan/witch coven look to the thrall part of the army and to the demons. A very druidic witch magic nature look and I need suggestions on where to find stuff like this so I can create a mood board and design the army. I want it to be a lot closer to how the current Sigmar Nurgle army is designed. Less mutation, more death & life magic.

Also just general opinions on this as a theme would be great. The sanguinius conversion will be a bit if a mix between the two. I plan to have him with a bit of a vulture harpy look but with regal armor adorned with skull & teeth decorations.