I got in contact with Angelique Shelley about using her work for one of my posts on secur.ity-pro.be and she gave me her explicit permission. I had put the license as Creative Commons while asking, which of course wasn’t correct. I should probably add a generic “all rights reserved” license to the license database.

Her email response was the following:

Hi Weekend,
Thanks for choosing my artwork for your blog, The license certainly isn’t creative commons, I retain the copyright, but I give you permission to use it in this instance.
Thanks again and have a great week! Angelique

This means that while I have permission to use her work, this doesn’t mean anyone else can without explicit permission.
You can find her artstation profile here.