After some research I dived into the challenge.

Yesterday finally Patricia found her face... but afterward, while working on the landscape the matter of perspective came up: the chambers in the Stone are cylinders, with the habitats on the whole of the internal surface. That posed some very interesting problems since it is a kind of perspective totally different from the one we experience everyday.

It was a day of experiments, trying to warp the lanscape I had drawn 'normal flat' into a believable fish-eye perspective...the last result feels quite interesting, the unusual view adding alieness to the otherwise mundane maritime setting of the fourth chamber.

Tomorrow will be drawing time, I feel I'm quite near the line-art step now, the composition is set.