My inkjet's photos look lousy | hp technical support
If you're not satisfied with your photo print quality, make sure that you're printing on the right paper. Generally, your printer manufacturer's branded photo paper will be better than third-party papers, and they may recommend a particular paper for your printer. In your software settings, be sure that you've selected the paper (or paper type) you're using, and that it's set for photo printing. If there's a high-quality photo setting, try that. Also, run through a nozzle cleaning and print head alignment.
If you're running low on one color of ink, you may see discoloration in your prints—it's time to change the ink tank in question. Also, particulates in the ink will eventually settle and can cause clogging, so you'll want to replace old tanks, even if they're partly or mostly full of ink.
