what you can do is hide the folders with the picture in it
create a folder > put ur picture in it > right click the folder > tick off "Hidden" (this will hide the folder)
to hide the folder go to tools (at top) > folder open > view > "hidden files or folder" > from there you can pick to hide the folder or show the folder that u ticked off ealier.
Indeed, a very solid encryption program, I used it myself long time ago.You can use TrueCrypt to create a mountable volume that is password protected. TrueCrypt is also available in a portable form so that it doesn't show up as an installed program.