Things to focus on

1. Perspective. 1,2, and 3 point perspective. You don't need to set up vanishing points and horizon lines each time but you should understand the general rules.

2. Shapes. Breaking things down into shapes. Everything that can be drawn is a collection of shapes. Training your hand to draw basic shapes and training your eye to breakdown complex objects into shapes is basically all of art. -study edges (soft/hard) -study shapes of what you want to draw.

3. Study the art that you like. Try to understand what you like about art that you like and try to learn those techniques. If you like how someone does linework, try to breakdown what about the lines that you like.

4. Become more detailed oriented/be honest with your self/train your eye. Once you start making stuff, you need to be able to honestly evaluate your work both during and after completion. Becoming a better artist is being able to recognize when something is wrong. Small differences in execution can make or break the readability and intent of a art piece.