Tested 8B pencil today

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Today I bought 8 Faber Castell pencils - B, 2B, 3B, 4B, 5B, 6B, 7B, 8B and decided to test them on a sketch of the goose.

I'm not sure how to use softer pencils. Do you use a few of them in one drawing or draw with a certain one all the time?

Tested 8B pencil today | Ecency