I think they would be fine if the 11 year old got them. ( In my opinion I think the 8 year old is to young, maybe just nail polish or stick on nails) As long as the 11 year old dont wear acrylic nails on a everyday basis I think its fine.
do u know if i can have acrilc nalis i am 7 nearls8 xxx
I agree with RockRose, a nice manicure is fine; fake nails on children, that's a little over the top and potentially tacky.
I would think the shop could do a really pretty simple child's manicure and polish that would make their hands look special and they'd have the salon experience.
I think long fake nails on children would look very out of place - but pretty polished and painted nails would be great.