Stay simple and experiment
Using the human figure as a starting point, try playing around with various poses cropped off in different ways. Draw small so you don’t get tied down in details. The goal is to crank out a lot of thumbnails in a short amount of time. You can get pose inspiration from reference image sites, photo shoots with friends and of course the trusty old mirror.
Draw shapes on different layers so you can move and scale them. Save a JPG every time you make a noticeable change, then look at all your images to see what stands out. Pay attention to where shapes point, what’s at the centre of your circles, and what the placement of your shapes emphasises. Direct the eye. Keep experimenting. Make lots of pots!
Like the figures and shapes, keep your colour palette simple. You don’t have to use white for the skin (emulating Nagel), but try making things as compositionally exciting as possible with seven colours or less. Use contrast to draw attention where you want it. Matching hues on the figure to those on the background can help make the two feel harmonious.