Congrats man! However, I'm not here for that C:<
I've fallen in love with you style and just how expressive it can be. I might experiment with some shading though. No no no, don't do the crazy rendering I do. (Please, you'll regret it.) I just might suggest having a brighter highlight on your pieces. In the case of the tank I might add a desaturated sort of gold. Something just a little brighter on the tank to make the drawing just pop a little more. I assume your light source is the sun so I might add a darker shading to the demon and crown to show that it's back lit. I would add more of a shadow of the demon on to the tank and possibly darken the dark orange you have on your tank already. Just keep in mind light sources. The skulls should be fine, but I might add more fading mountains in the distance. I think it might be interesting to have the words in the back were drawn as it they were a giant mountain carved into.
That's about it! But why are the zeroes in the "100" in the title Os?