After hours and hours, here's my assignment for lesson two.
Don't know you guys, but it took me a lifetime to get into the color/overlay thing, in terms of saturation and stuff.
In the end I was messing with final hue/levels adjustments, so I decided it was time to upload.
Oh, yeah. I put some yellow glows on those zombies, as if they had some fire. I thought "Ok, what's better than zombie natives? Fiery zombie natives".