For happiness and prosperity, put such a picture of Maa Lakshmi in your house:

 
In Sanatan tradition, Maa Lakshmi is known as the goddess of wealth. Happiness and prosperity come to the house by the grace of Maa Lakshmi. According to beliefs, keeping a special picture of Goddess Lakshmi in the house keeps her grace intact. The image of Maa Lakshmi with the Airavat elephant is considered very auspicious. Due to the effect of this image, there is never a shortage of wealth in the house.According to the scriptures, worshiping Goddess Lakshmi brings wealth and prosperity. People in the family remain disease-free. Therefore, a picture of Goddess Lakshmi must be kept in the house. According to astrology, keeping a picture of Goddess Lakshmi with Airavat elephant in the house is considered especially auspicious. The image of Goddess Lakshmi with Airavat elephant is considered very auspicious. If there is a vase in the elephant’s trunk in the image, then it bestows the special blessings of Goddess Lakshmi.
It is noteworthy that the goddess Lakshmi riding on an elephant is called Gajalakshmi. By worshipping this form of the goddess, a person gets relief from all kinds of financial and other problems. Keeping such a picture or idol of goddess Lakshmi riding on an elephant in the house opens the way to prosperity, happiness, peace, splendor, wealth and progress. Positive energy remains in the entire house.
The idol or picture of Gajalakshmi should be kept in the north-east corner of the house or on the right side of the temple. Keeping the idol of Goddess Lakshmi riding a horse in the north direction is also considered auspicious. By placing the picture of Gajalakshmi in these directions, the blessings of Goddess Lakshmi are showered on the family members.
Similarly, a silver or golden elephant in the auspicious chariot of Goddess Lakshmi is considered very sacred. Goddess Lakshmi riding an elephant is a symbol of health, happiness and success. Keeping such a picture of Goddess Lakshmi in the house also brings blessings of other gods and goddesses. Such an image or idol removes obstacles coming in the way and paves the way for progress.