The last homework from my online workshop is about perspective. Above is the final result. I was rushing to get this drawing done as the sun was coming down and took a picture of the area so that I could properly add the shading afterwards. That's a tricky thing with urban sketching : The longer you take, the more the scenery changes so it's important to be aware of that when you draw. When I have more time on site, I wait until I finish the line drawing and then add the shading all at once in order for the drawing to be more realistic as opposed to have shades from multiple time period. If I don't have time, I just take a picture and use it as a reference to add the final details afterwards. Adding people is a different thing. I like to add them as they come and go. I feel that way my sketch transcends time.