Surprisingly, i didn't use any of those except skull. Here is the prompt for one...
metallic obsidian black (lapis lazuli and gold sheen skull with ominous glowing red eyes) Josephine Wall style backlit finely detailed illustration brain froud detail <80sDarkFantasySD15b> <4nn4k3ndrick>
Most of the ones from this post are a variation of that prompt with tweaks along the way.
Interesting because the AI decided that the design looks more cool with the demonic apperance which it does.
Do you think AI's like this can replace concept artists in the future?
I think AI will be a tool to use for concept and other artists. There is also an art in how to prompt the AI to create something close to what is conceptualized. It's come very far in a short time... so who knows in the distant future, but for now... real artists shouldn't be too worried about losing their jobs in my opinion.
That's good to hear and I sincerely hope that we get to see a future where artists use AI to reduce workload and bring out great works in a short amount of time.