It's done. I started this work over a year ago now I've finished this work!
Have a look of the beginning of this work. I made a video: http://www.ustream.tv/channel/drawing-bubblebath
Faber-Castell Pencils: from 2H to 8B; Mechanical Pen 0,7
Kneaded Eraser + Normal Eraser
Cosmetic Pads + Blending stumps
time so far: ~10 hours