One of the hardest things to master when drawing is perspective. To translate something that is 3 dimensional onto a paper plane that is 2 dimensional has its challenges. I’ve been skimming through a book right now called Drawing on the Right Side of the Brain by Betty Edwards. First, I would HIGHLY recommend it for both the beginning & advanced pencil artist. Second, she has some extraordinary exercises to increase your ‘perceiving’ skills.. one of them being perspective & she has her readers practice drawing foreshortened perspective–one of the hardest things to draw.
They’re not the most aesthetically beautiful, but they were invaluable, and a stretch from my comfort zone. I like drawing from pictures, from images that are already flattened to 2D..
The first picture (the foot) was done from an image, the second (the outstretched hand) was my own hand, done in real life (within a 5 minute time frame), and the last one (the running feet) was the most difficult–it was done from memory, without a 2D or 3D reference. You can definitely tell which is which! HA!