Sketching out  a logo idea is never a bad idea. In fact, it's a very  good idea. Sketching gets things going faster than a computer will. Plus your working through problems with your imagination instead of a mouse. In this sketch for Tatum Hauck's Musicians Health Alliance I knew spontaneously that the 'hills of health' sketch on the right 'worked'. But it took every line and thought on the left to get me there