Most photos are cut to a 4"x6" style photos unless otherwise stated, as per Hillary.
Usual prices, without a package deal are:
16x20 poster = $30
If you'd like a set of one photo, like 50 of a 4x6 = $2 apiece for $100.
Please let me know what kind of changes you'd like for each photo, and we are still waiting for your other daughter to try to copy her in to a couple of photos.