I think it looks good with the shading. However I would stay way from using a dremel. The dremel causes a "splotchy" kinda look in scrimshaw, where the lines sometimes don't connect correctly..HOWEVER your scrimshaw looks pretty good from where I sit, you done a good job with it. As long as it pleases you.. that's all that matters.
My tools of scrimming are a sharp leather punch and an exacto knife. I've been scrimming for a short while... so take my 2 cents for what it's worth.. :thumbsup: