I would create a link in her home folder, or desktop to your pics folder.
chmod -R 770 ~/Pictures # Makes ALL files and sub-directories in Pictures read/writeable to user and group
sudo ln -s ~/Pictures /home/mywife/Hubbies-Pics # Make a link to my pics folder in my wife's home folder
groups # Show a list of all the groups I am a member of, [b]mygroupname[/b] will be the first one, just to make sure
sudo groupmems --group mygroupname --add mywifesusername # Add my wife's username to my group
Of course you will have to change the above info to suit, but that should make the folder available and read/write to her.
You could make it simpler by chmodding ~/Pictures to 777 and skipping the groups stuff, but that would make it read/write to everyone, although it shouldn't really matter if your home folder is set to 700 as nobody else (apart from root) will be able to enter your home folder unless you give them the link.