The photo should be of Vishnu having the Sudarshan Chakra [Glowing/Flaming Disk like Weapon having 108 Sharp Edges], a Gada [a Club like Blunt Mace], a Shankh [Conch Shell] in his hands and Brahma Deva [the Creator] sitting in a Lotus Flower which has emerged from the Navel of Vishnu, the Goddess Laxmi should be in a standing position by his side.
This image, which is a common sight in Hindu mythology and religious scriptures, is descriptive of the Cosmic or Universal form of Vishnu or Mahavishnu. The photo signifies Vishnu as the Universal Being overseeing the unending Cosmic Time Cycle of creation, destruction with nothingness in between.
Such a photo is believed to most auspicious in gaining the blessings of both Vishnu and the Goddess of wealth and abundance Laxmi. The worship of Laxmi become more powerful and potent if it is done along with that of Vishnu.