You have photoshop, right? have the original photo (the reference) scanned and saved. Open in PS and desaturate it (ctrl+shift+u, or cmd+shift+u for Mac). Now, compare the b/w version with the color version, understand and make note of what colors (in color version) are of light values, mid values and dark values (in b/w version). That's a first step, there's a lot more to it actually, but that's a start. If your reference is already a b/w photo then group the tones to 3 basic values (light, middle and dark), again, make note and understand them
Waiting for next update here, studies perhaps, doodles, ideas or anything?

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