Which faces!?

Hello everyone!!
Firs of all, I want to let you know how much I appreciate this "face Paint" family we have!! It's great to have a bunch of people who know what you are talking about and can share their experience with you!!!
Now, I have a party of 30 to 40 kids coming up soon.
I am struggling with which faces to show on the poster. My average time is about 6 to 7 minutes per face if it's not monsters or more detailed things. I want to bring a variety of choices but still give a satisfying quality which is not quickies only!
Which would you recommend? I have to do both boys an girls.. Girls is Fairy theme.. tinker bell..so I am thinking to do: for girls..
* Flower crowns and swirls
* Butterflies
*Bunnies and cats
* masks
and for boys:
*Batman
*spiderman /venom
*Skull
* Snake on the face
*Dino/Lezard or Shark
*Crown
*Sport ball and flames

What do you think?

I suggest just have a list then you dont have to paint the same thing over and over. You can vary the way you paint . More detail if time less if you need to work faster. How long is the party? You need to divide the number of faces you can paint in an hour.then times how long the party is. So if party is 2hour working on your 6 to7 mins that would 10 faces per hour So 20 faces in 2 hours and you would still have 10 to 20 unpainted so you would need to paint quicker designs but if party is 4 hours you would fit everyone in. Hope that helps with planning and good luck.

Thanks Peachymango! I assumed the party is of 2h. but I will call the mom and find out if the party will last longer...I might have to propose to get paid for longer than 2 h...
Thanks !