Skipped school today oops! But I painted the underground today!
Made the first layer with the wet-in-wet method and let it dry. After that I began to repaint the contour of the fish on the ground and started the shadow with Marsblack. Only mixed it with lots of water.
Also repainted some scales of the fish, so that the contour with the dark background is more visible. After that I began with the light-yellowish stripes on the floor.. Now its in the varnish, so I will post one new pic when this one is finished all the way, including my name in the lower right corner!!