Notice that the ink cartridges have been loaded and little used. That is the first truth we have to swallow. If the imaging concerned is of a creative, subjective or interpretive nature, most people will be satisfied with a fairly close match. Not so the graphics professional. It really boils down to a matter of how much you are prepared to pay in order to obtain chromatic perfection.
Reason is likely to be dictated here by the cost of the printer itself.
After all, a full-fledged color management system costs more than the tabloid Epson Photo Stylus. At the lower end, this is usually a puck which sucks onto your monitor and measures the chromatic values projected by the electron guns. Such a colorimeter takes out the visual guesswork. We cannot go into any depth here on calibrating a monitor, which should be carried out before the printer. Whichever way you decide to go, and there are several different approaches, you are bound to need some kind of basic yardstick or reference for tuning and comparisons at all levels.