I had this sudden thought of a person sitting on an orb, floating above the ruins of a city. The idea evolved into a person offering blood to the orb, which also evolved from its original ideation of being a mechanical orb.
6. anatomy fixes and minor touchups with textures
5. improving lighting, material indications, color changes and more details.
4. building up on gradient map
3a - gradient map, warm dark red and near black
3b - gradient map, red room with blueish light
3c - gradient map, purple room with red-ish pink light
3d - gradient map, red light with blue-ish room
2. more environment details, and design work around the ruins
1. selected thumbnail, cleaned up slightly with added details