second one, the recent aquarium pic(s). more my usual method. starts with a body and position, add a head, background, then stuff.
added some parts from the second picture with the burning for explanation.
top left: frame from a 50's TV, the cleaned body, two bodies for movement and action, the chain is hidden in the pic, yellow stuff is residue
from the yellow stream on the right. burning legs from the other pic. next to the right, the inlet pipe.
top right: window glass, only down to the "water level" so you have a clear view of what is going on under "water".
On the very right the original not yet completely cleaned body hidden in the pic. the body left of it is from the burning pic.
notice, that she is pulling the dildo deep inside her ass. to create that, several bodies were modified and merged. also the body is twisted
a bit, for action. the rest is more or less self-explanatory I guess.