I can't imagine how hard you must work to get your art so clean
A drawing like that usually takes me several hours, or a full afternoon if I don't take breaks. Sketching usually doesn't take that long (it depends on the subject I'm sketching), but lining with pen and shading with colored pencils is what takes up the most time. I have to go slow to make sure each line is smooth and bold. And shading just takes forever. Layers upon layers upon layers.
So basically, yes. It takes a lot of time and effort. In comparison, plain pencil drawings/sketches take me about 30 mins. So in order to actually finish one of the big drawings I start, I have to have a lot of inspiration and motivation.
But it's worth it in the end. Every time I see the finished version I get so happy. And then showing you guys makes it even better <3