Well, here is the next video. It shows some further development of the characters. These were painted against a white background, and what you see in the video is that their silhouettes were then painted in a flat dark brown tone. The layer of the silhouettes is underneath the one with the shading of the characters. By setting that shading layer to 'multiply' the colours in that layer will interact with the layer underneath in a specific way. Generally, 'multiply' adds portions of the images that are dark in the shading layer as additional darkness to the silhouette layer, but any light portions will not lighten the silhouette layer.
Afterwards, I flip on the 'walls' layer as well as the planet layer, that here is simply a render from my Furaha model in Vue. To get a more painterly effect I will later paint it completely anew; actually, at the time of writing I have already done so.
In the meantime I also reworked the walls. I liked Spugpows remark that the walls had an art nouveau feeling, so I took that literally and decorated them and the floor with Art Nouveau patterns. I will probably show the result of that in more detail next weekend.