You are correct! The sketch for this one took roughly 10-20 minutes. As for the coloring... between 30-40 minutes. However, with each piece I spend probably a few hours experimenting with Photoshop and it's many, MANY features as I'm only vaguely familiar with the program and have rarely ever used it (all estimated times do not include time spent goofing around).Hope that answers your question, and thanks for the compliment!