Can you add a sticker?
The base warpaint I used doesn't have that option.

I can sometime make a separate submission using a different base that has the sticker, but it'd sacrifice team variation and color regions that the original has.

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Why is there no BLU version?
There is - RED has warm orange, BLU is bright orange/yellow.

Those two hue variations are used on default merc models and plenty other objects in game. You can go to Loadout.tf and for example look at Soldier's or Pyro's chest grenades, the exact same thing happens here.

So while the differences are a bit subtle on this warpaint, they respectfully follow TF2's default team recognition colors.

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Won't it still confuse players?
When I tested the warpaint myself, not really.

Someone's choices on the big paint regions of their cosmetics, them getting accepted, and the few existing people abusing it to troll aren't my responsibility. The warpaint on it's own isn't impacting gameplay.

Embrace the Robin.