People who have bought my book have showed me their finished pieces and shamed me into doing some colouring.
Most of my pencils are really cheap ones and do not give great coverage. I’ve seen people recommending Vaseline but I didn’t play well with that. I had it everywhere except where it should be. So then I tied baby oil. The cotton bud was too fat to control and the oil was bleeding and the smudgy, tortillion things was too hard. Then I remembered a nail polish removal pen gizmo that you are supposed to fill with polish remover to clean all the messy bits of your skin. That dipped in a tiny bit of oil works great and I’m able to hold it like a pen so have much more control.