Created for Photo Reference:1 hour and 45 min. Might be 2 hours. I'm not sure because I got lost track of time in the middle of a spontaneous break, but I'm positive it's under 2 hours. My process: well, I wanted to keep it loose and don't stress over the accuracy. For composition, I made the tower bigger. I think I succeeded with it.Of course there are few perspective errors to fix, but... most importantly, I had fun with it.