The correct hair color will be able to change the appearance of a face in a subtle way giving it more depth, dimension, and balance to its natural form. In the case of round-faced, it is often aimed at adding the illusion of length, and definition and increasing the brightness. The careful use of color, prudent tones and gentle contrasts can all collaborate to emphasize features, lighten fullness and add a more sculpted appearance without altering the hair cut itself.
Soft Highlights

Light touches around the face could bring gentle lightening to the face which is rounded, and the light effect becomes elongated. The emphasis on less dense tones in a particular set of strands gives the impression that the entire effect is lightened and is naturally dimensional without making it too dramatic.
Face Framing

Face framing colors also highlight other features like the cheekbones and jawline which is a mild way of redefining the face structure. Lighter tones used in the areas towards the front will point downwards and produce the illusion of elongation which works well with round faces.
Dimensional Balayage

Dimensional balayage creates a smooth combination of different tones, which adds depth to the hair, so that they do not lie flat on a round face. This method is capable of slow lightness, which contributes to motion and more sculptural look with contrast.
Root Shadowing

Root shadowing maintains the upper part a bit darker and lets the lengths light and this makes the face look longer. This juxtaposition provides the effect of vertical dimensionality, so the total profile seems to be more stable and not as round.
Warm Undertones

Warm shades like caramel, honey, or golden brown will make the complexion brighter and the edges of the round face softer. The light reflected by these tones also improves the natural light and makes the facial contours less accentuated and less eye-catching.
Cool Contours

Soft colors such as ash brown or soft beige can also be used to bring out some form of definition, with a slight shadow being cast in the hair. These colder colors are used to shape out the face visually, with a more structured and polished appearance and with no harsh contrasts.
Vertical Streaks

Vertical streaks of colour put strategically through the hair assist in directing the eye to go down as opposed to sideways. This method minimises the presence of width and helps to give a longer facial impression.
Subtle Ombre

An ombre effect is also used subtly, moving towards darker roots to lighter ends, providing some sort of vertical movement and depth. This effect of gradient gives length and an appearance of slimming a line in the face which is good in responding to the round face shape.
Glossy Finish

Glossy finish is an added value that will reflect the light throughout the hair and make it look polished and healthy regardless of the color chosen. Shine is able to focus on dimension as well as making light tones to shine in a soft and flattering manner.
Muted Contrast

Muted contrast does not give too strong contrast between the shades, but rather the combination is a harmonious mix, which is natural and smooth. This treatment guarantees that the color makes facial features more attractive without unduly adding color contrast to make a shape and interest.