Drawing from Observation: Placement and Proportion

I believe biggest weakness in art is my lack of patience. This causes problems with planning and when drawing things where scale is very important. I tend to start and speed up and eventually, because of small errors the scale ends up being terrible. When doing these drawings I started with a steady approach but eventually small mistakes led to other small mistakes and the scale became inaccurate. My success in these projects came from drawing the shapes themselves. Although they were not always in the right place, I was happy with the appearance of most of my shapes. The final outcome, in my opinion, was decent. I feel that with practice and maybe a little more focus my ability to draw things to scale will improve a lot.