I started with the idea of an underwater cathedral,
but I had to paint something well known, I chose St.Peters Basilica, the nave view from the altar looks good.
quick b&w sketch :
I had to break it a little, in order to stick to the post-apocalyptic atmosphere. I also needed an open space to show that's the scene really takes place underwater :
Some smoke/dust particles and plants/anemone.
Blue atmosphere + light above the ruin
Funny floating skeletons, corals and some orange lights and particles.
Color balance and here we are.
