And here's what you're missing:
It wouldn't be a sexualized thing if they didn't explicitly state Harley Quinn had to be -naked- in the 4th pannel. Right now it's a mixture of both "What? Why are they killing Harley Quinn?" and "What? Why does she have to be naked?!" along with a dose of "Why the hell are they even running this contest?!"
Again, if it were batman, or the joker, the outrage would be over it being the batman or the joker killing themselves. Not because they were nude, or sexualized.
The same should be true for Harley Quinn (up to a point, because she's just flipping insane..)
As for the naked thing.
Where do they say we have to see her naked?
They say she has to be naked, but that doesn't mean we have to see it.
How would you do this?
Show her
costume draped on the floor next to the bathtub.
Showing a typical women in a bathtub scene without nudity.. Sexualized? Possibly, but that should be irrelevant.
And ask your self this.
What if they requested a picture, of the Joker swinging from a noose, a chair by his feet. And his pants down around his ankles?
Or Batman, naked under his cape, in an alley, with a gun to his head.
The point I'm making here is that nudity =/= sexualized. The joker case would definitely be sexualized (as it was a sexual act) but still not exactly something normal people would find
sexy.
They don't want an image where she happens to be nude though. They want to *see* nudity. They want her exposed. They want to see skin. They want the artist to make it known she has no clothes on. Her nakedness isn't par for course like it would be expected in the bath. Her figure isn't mundane. They go out of their way to demand her body be seen.
While she's killing herself.
Again, consider these: "Draw for me a woman killing herself in the bath."
"Draw for me a woman killing herself in the bath. Make sure she's naked."
Guess which one is seedy.
Harley Quinn is always seen in her costume/s. Without it. Is she Harley Quinn? Why is she naked, and not in her costume? Could it be, perhaps there intent is that she is no longer Harley Quinn?