I think the only problem with the necktie is that it looks like a flat texture. If given some volume it’d work really well. As for witch to use i’d prefer the necktie since it it doesn’t leave the torso like a blank canvas;
Utimately it depends on where in the game the duck is going to be seen first, first impression matters a lot. If it is in a really plain room, like a barren office with white walls the colors of the bowtie might give some contrast with the blandness of the room; If the room is more caotic, seeing the duck more “put togheter” than it’s surrounding helps break with the ambient.
(Its been a while since i played portal, so my memory it’s a little fuzzy, but if i remember correctly it worked so well because in the monotone enviroment of the test chambers, having something as simple as a cube with a heart was enough of a break from the mold to be memorable, also it had interactions with it in the game; an option would be to somehow integrate it into the game in like a small puzzle of sorts, making it appear near the button when the player comes and goes, stuff like that)
With that though i need to say that i am colorblind, so take my 2 cents with a grain of salt.
One was hungry; they’re trading mice!
I’ll see myself out.