try using different colors and blend them together. dont fill an area with a color alone. For getting darker areas in an apple you dont just put pressure and apply red heavily. just use brown black and darker red, even dark blue Once you start experimenting, you will be amazed by the results! So start experimenting and u can get glowing like effect with different colors. I currently use Cretacolor karmina. But i think there are far better pencils available in the market.