Hello idwalton72.
Welcome to the HP Forums! I understand your concerns with your Officejet 8600 Plus. When printing a photo, you want to make sure you have changed the correct settings within the program you are printing from.
What program are you printing from?
Depending on this program, there should be a setting called "Quality", you want to make sure this is set to "best draft". Please reference this HP document on How to Print Photos Using the Printer Software.
If this doesn't resolve your issue, then try printing a "Self Test Report" from this HP document Common Print Quality Problems. If you are receiving a detective printout from this test report, then continue following this document.
Please inform me your troubleshooting steps.