How does one get started in improving their doodling/painting? I see your amazing handiwork and wonder if you had a book or resource that you would point somebody toward, if they were trying to improve their drawing skills.
Drawing on the Right Side of the Brain by Betty Edwards, is a pretty interesting book that can help unlock potential—it's got some cool exercises. One comes to mind of copying a Picasso drawing of Igor Stravinsky, but, it's upside down. This forces you to look at the lines and their relationships to each other in the abstract as opposed what you think you know in terms of a face, where you make assumptions about where you think elements like the ears, eyes, nose, etc., should be.
The best way to improve your drawing is to draw from life, and keep doing that more. It helps to observe and measure and check the relationship between things you see and pay attention to the space between them. I'm sure you've seen old cartoons of artists holding their thumbs up when viewing a model and drawing. What they're actually doing is measuring what they see in front of them and marking the corresponding measurement on the paper—I would use my pencil and hold it up to what I see, use my thumb to mark how long an arm might be against the pencil, then use that measurement to make a mark that matches the arm length I'm drawing on the paper. Now, I have a unit of measure that I can check other parts of the body against. Is the other thing two arms? Half an arm? You can check various things and angles by measuring their relationships to each other.
If you're drawing a box in perspective and there is a vertical line (the corner of the box), you can check the diagonals and think of it like hands on a clock. Is it 2:30? Is it 11:50?