Create a new file that would have 217x450px, 300 dpi, then take the indicated tool and create the background for the picture to be.



Fill 0 % on the layers.
Blending Options-Gradient Overlay



Gradient?s parameters:



Take now this instrument and represent an ellipse of white color.



Copy the new made layer and make use of Free Transform option to increase the copy and place it the right way, indicated in the picture below.