Millidge did a video breakdown of how he put together the cover for Sherlock: The Blind Banker #2 using different layers You can read his whole blog post about it here.
And if you want to pre-order his books:
Meanwhile…#5 (Soaring Penguin Press) [Jan 2017] DEC161883
Sherlock: The Blind Banker #2 Cover 'A' (Titan Comics) [Feb 8[...]
