Very nice checkerboard pattern. I have does some freehand checks on a Warhammer 40,000 Ork Deff Dread, and it is very hard to make it look good up close. My only saving grace is that Orks are slapdash by nature in the background material. These are also quite small. I now have 1mm masking tape in my arsenal for the next time I try something like this.
Very nice work for freehand painting mate. Much better than I could do free hand.