if you're looking for a ready-to-use and highly-customizable solution i can recommend gallery 2 and using a joomla-gallery2 bridge for implementation. it might be a bigger afford in the beginning to set everything up, but in the end it pays out. you can easily set a gallery-only account up for him and he will be able to upload all his work without any hazzle.
Gallery | Your photos on your website
Joomla! Extensions Directory - Gallery 2 Bridge