I registered Childrens.gallery myself. Either you got Kids.gallery ahead of me or else I decided not to bother. Can't remember now.
So Kids.gallery has a chance of selling.
The other 3 were not worth registering, in my opinion.
HERE'S WHAT'S IMPORTANT:
I cannot even appraise my own domains in these new extensions. The data is insufficient. I'm seeing a few such domains sell in the lower $x,xxx -- mostly $1,xxx. But for every good domain that does sell, there are 1,000 or 10,000 that remain unsold.
Domains in these vanity extensions are high risk investments. If you're new to domaining and haven't sold many domains, then you probably should be experimenting in other areas. Established extensions like .COM are cheaper, sell more easily, sell more often, and sell for more.