For the moment my happiness about finally being able to sketch has given away to frustration about not being able to find good motifs. But I had a good talk with my prof, took a break, went home and decided to stop drawing for a bit until I've found a solid / more subtle / more simple concept to visualize my thesis. Still confident it's gonna work out somehow. I'll still have time to panic one month prior to the exams :D. Until then, here's a closeup of one of the better sketches.