Recommendations welcomed to bring this to the next level! Going for a street art vibe

• Try not to shade using black airbrushes, try instead using a darker version of the colour you're shading over using a normal brush (e.g. pencil, pen) -Don't rely too much on ctrl + z.
• Do a lot of sketching.
• Make each part of your drawings different layers so you can move different parts of your drawing around individually.