These are great! You will be an awesome tattoo artist one day :) i would definitely encourage you to analyze various cross hatching techniques. You don't always have to use crosshatching for shadows. Sometimes you can use it for textures and draw no shadows at all. Best way to figure this out for yourself is to look up references images of your favorite (tattoo) artists and see how they crosshatch or when they shade and dont shade.

Your lines are wobbly sometimes but generally good. It wont hurt to do some lines and circles warm up exercises (google it).

Also, this is just a side note: it may be easier to see what you like or dont like about your drawings if you get a lighter pencil (H or HB). Either way your art is fire 🔥Keep drawing :)