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dwdrawings:
Mable! I used to have the same problem, but what I soon realized that using my finger left grease on the page and ultimately clumped the graphite together which could then ruin the picture, A q-tip will blend the tones effortlessly just rub it lightly in circular motions or against the shape of the face, also if you're doing a larger scale, fold some tissue a couple times and use that to blend an even tone! If you need any more tips feel free to ask.
dwdrawings:
Oh, and lean on another piece of paper over the top of your drawing to stop your hand smudging your hard work :)