I like this lots mate! I know a great artist when I see someone using tine variance example being thos who let's take the nmm technique you've used 1) it's very good technique but what enhances it is the browns, sometimes purples that you've used other than just a darker grey. It's more pleasing to the eye aesthetically when as many colors are viewed to the eye of the spectrum can be seen . You've done this here. And a whopping 8.5 is what you get. So. 9 is what I'll give.