Hello, my name is Syd and I am with Epson America
This can be caused by a variety of reasons. Incorrect settings in application or driver, monitor calibration, or even printer issue itself.
With any color issue, the first thing to do would be a nozzle check on your printer. This will ensure all nozzles are firing and printer is printing the way it should. If there are missing nozzles, the color may not be correct. Make sure the nozzle check looks good.
If your monitor is calibrated, the next step would be the settings. Make sure the paper and quality type is correct. The driver is designed for Epson paper and you should see the reference guide to make sure you have the correct paper setting. If using a 3rd party paper, that company may have an ICC profile or recommendation as to what printer setting to use for best results.
Also, if you are using a higher end photo software such as an Adobe product or Aperature, make sure you have Epson Color DISABLED in the driver. This will ensure only what you send to it is printed with nothing added.