There are actually a lot of simple things you could do to improve these some bit:
- Sharpen your pencil.
- I bet what you're using is a 2B pencil as well, use a HB pencil xD
- You apply way too much pressure when you draw, ease up a bit.
- Spend some time planning your drawing (e.g. do some light lines first and then adjusting them). Don't just scratch in your final lines as soon as you pick up the pencil
- Take some time to observe things. Do some still life drawings to improve your observation skills. This will help you come up with things straight from your head.
In my opinion, they're not too sketchy; they're not sketchy enough. It's better to have something messy that's refined throughroughly than something that's neat and a tad strange looking. Don't be afraid of having messy drawings, it's fine! :)
