Man, I'm on a ROLL this week.
This was really enjoyable until I had to struggle with colour complementary and landscape. :C I could just put green landscape, and it would've been really soft and easy on the eyes looking; too easy and too perfect. Yeah it made it look nice but since the camo on both tanks are dominant on green, then the whole drawing wouldve been just green. I think that won't be a problem since the blue sky compliments the colour but I wanted to try something different.
edit: Reedited work after realizing I could do highlights as easy as I could do shading. I didn't realize I could highlight by changing options on the layer section. Usually I just multiply layers of grey to create shade but never thought of doing the same thing on highlighting till just now.