Well, this is what has kept me busy the past 20-25 hrs. I saw a guy on Instagram doing this so I thought I should try it. I had a replica skull and some bubble wrap and took my own reference. The skull it self took 20 minutes to do and the rest too all the other time. All of the bubble were made with erasers and blades. No white was used at all. It is on a 300mm x 300mm size Schoellershammer #4 paper with Schmincke paint and Evolution AL. BTW, these photos were not converted to greyscale although it may look like it. Especially the dimensional one.