If you’ve uploaded photos to your Google+ account, you can use Google Now to retrieve them. This can be achieved by either a manual or a voice-activated search. By default with a voice search you use the phrase ‘OK Google my photos’, which should display all of your recently uploaded photos.
However, the system is more intelligent than that so if you have, say, images with a snow back ground, you can say ‘OK Google my photos snow’ and it will display all the photos matching this criterion. Likewise you could say ‘OK Google my photos landscape’ or ‘OK Google my photos beach’ – hopefully this will give you a rough idea of how useful this feature is.