You mean, could I make a separate illusion of you, rather than simply transforming my own appearance...?

Well...
I could, yes. That is, there's no reason I couldn't. It would be quite a bit more complex, but...

[ his brow furrows... or, well, "hisoka's" brow furrows... as he attempts to calculate the ceremonial orders. probably it's at least an order of magnitude more involved, but he is a genius magician, after all, so... ]

It would take me a bit of time to develop.
But yes, without a doubt, it can be done.