Do you have any other options on suits? I'm not sure where this stands on the opinion/accepted wisdom continuum, but to me color in evening wear is to be almost entirely avoided. It always comes out looking tacky. The most non-black-white-or-dark-navy I'd accept under ideal circumstances would be garnet studs and/or links, or VERY dark maroon socks.
Frank Sinatra famously enjoyed wearing orange pocket squares with his tuxedo, so clearly there are famous dressers who disagree. On the other hand you're probably not as good looking and charismatic as Frank Sinatra (no offense).
At the least, I'd recommend keeping it simpler this time and adding something more colorful after you have mastered the basics. If you maintain an interest in clothing, you will likely look back at any of these three outfits as a youthful indiscretion. If you decide you just have to do it anyway, no kittens will die because of it though.
I agree with Clag that of the three, the first is definitely the best. We can toss out the third immediately as the tie and pocket square are just not good together, and possibly no good under any circumstances. In number two, the tie and PS seem nice separately, but are terrible together. Patterns are too close in scale and the color combination is not good at all. That suit and tie are begging for a white pocket square. Put on a white pocket square, and it's fine. But add a white square to the first fit, and it's better than the second, mainly because that is an evening necktie, and so turns this into an evening outfit, rather than a business one, which is a good thing for a social event that takes places at night.
