Seriously what the hell? 

I opted to try Neverness' approach and took these finished
photos outside in natural light.

Oh, I know I said. I'll put aquilas on 3 sides, and then paint the feathers in a rainbow of colors! Sure. Sounds great. Unlike the marine's pauldrons there's no edges to help hold the bristles in
line, instead all that's needed is a steady hand. I can do that
right? 

The blue circle with the number 3 on the turret marks this out as having originally been the 3rd predator assigned to the Rainbow Warriors' 9th Company. 

Well yes...apparently. 

Note the two service studs on the severed head. Clearly this was a marine, though from what chapter or renegade warband is unknown.

But it was a fucking nightmare to actually do! And of course after accomplishing that feat from hell, there comes the fact that this is the last surviving tank from a dying chapter. One whose last few marines have more important shit to do (like surviving) to not bother with cleaning the grime and filth off of the hull. As such, said filth obscures about half of the detail on those rainbow-painted-aquilas (which in hindsight might not be such a bad thing given my sloppiness).

So...once again, this tank is painted and ready to die do battle on the table top.

Anyways, the damned thing is done barring the clear coat (which I'm out of currently). I like it. Its filthy yes, but that's my usual preference for tanks anyways. So I guess for the Rainbow Warriors its onto either some more tactical marines, or else Primaris Lt. Budderbarz.