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I actually did the final version of this request 3 times before I got it right, or at least till I was happy with it.
The first was all gray tone washes and it just didn't pop. The second was all gray tone markers and it was sooo muddy. I was happy with the third which I added more flat blacks and then a few washes.
Time and time again I tend to over work images and end up ruining them... some times it works... but that's often few and far between.
Keep it simple.
-Drew