Great stuff. I love the palette of the first image you posted, and the fourth one reminds me of assassin's creed II. I find that the two greyscale compositions you've made lack a bit of intensity : the "zoo" isn't really detailed or contrasted compared to the others.
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i like em.
edit* - does that guy have a mullet?
Good eye on the AC layout and agreed on the black and whites. couple more less than 1 hour speedpaints.