Well, Googling her name definitely got some good results!
That is, depending on whether or not you are willing to lie on the floor for a pose!
If you Google "Yui Diabolik Lovers" you can see a wide array of choices in terms of poses that you can try, of course, you should wear your cosplay while trying out these poses to ensure that there's no unexpected lifting of your shirt or to ensure that there isn't a snug spot or pinch area while you are doing the poses for pictures.
These poses may or may not interest you but you can at least look at them and see if there's anything for you to work with!
cυrrεηт ωιρ cσsтυмε(s)
-Various Overwatch stuff
-Purah, LoZ: Breath of the Wild
-Sakizo(This shouldn't be a surprise!)
cσмρℓεтε∂ cσsтυмε(s) σf 2017:
-Card Captor Sakura
cσηvεηтισηs ι αттεη∂/ωιℓℓ вε αттεη∂ιηg:
Raleigh Super Con 2017?