>>9964045Nothing wrong with adding white per se, as long as there is a noticeable difference between the highight and shadow colors. If your shadow color were darker there would be no problem with the highlight.
In pic related the shadow is way WAY overdone (it was my first attempt to use an airbrush), but the difference between the light and shadow colors is actually okay, the color just needed to be much more dilute so that the contrast is not that huge.