Blue Brown Minimalism
Sometimes simple is better. I am always tempted to add more. More shapes, more colors, more details. Each quadrant has large, slowly transitioning color. It just begs to put something more there. I found it is useful to just stop, set the image aside for a day. Usually after a day the temptation to keep tweaking is gone, and it is easier to decide that the image is done.
This is the first of a few with relatively low complexity, and similar color palette.