Here is a step-by-step process I took when drawing this bespoke artwork commission for a fundraising auction.  I began by drawing the outline of the subject and gradually built up the mid-tones of white and grey throughout the petals.  Without giving away too many secrets of an artist, as I went along I added in the background which helped me to decide on the tonal factors for the rest of the detail.

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Click through each image for a description of the steps.