The repetition of practice is obvious, committing the thousands of nuances you find in wine to memory is a bit more challenging. The tint and hue of a wine is both pleasurable and informative.
Red wines vary from purple-ruby to deep garnet.
Generally, the deeper, more vibrant the color of the wine, the younger it is. With a few ounces of wine in your glass, tilt the glass so that the wine moves up to the inner rim of the glass. Inspect the color and clarity of the wine. Using a plain white background and color-corrected lighting helps assess the wine's color and clarity. This technique can look pretentious, but it helps to volatize the wine's alcohol, magnifying the aromatic components.