The invention relates to cosmetic methods for improving the microparasol organization in keratinocytes, protecting skin against ultraviolet radiation, decreasing DNA photodamage in keratinocytes and melanocytes, attenuating age-related pigmentation defects and the effects of photoaging on the skin. The methods include applying a composition comprising a peptide compound of general formula (I), R1-(AA)n-X1—X2—X3-Asp-Leu-Lys-Lys-X4—X5-(AA)p-R2, and a cosmetically acceptable medium.