How Sri Rama and Lakshmana look like?

 a)    According to Valmiki Ramayana, Sri Rama has dark-brown complexion.

दुन्दुभि स्वन निर्घोषः स्निग्ध वर्णः प्रतापवान् |

समः सम विभक्त अन्गो वर्णम् श्यामम् समाश्रितः || ५-३५-१६

"He has a voice like the sound of a kettle-drum. He has a shining skin. He is full of splendour. He is square-built. His limbs are built symmetrically. He is endowed with a dark-brown complexion."

b)  And, Lakshmana resembles his brother Sri Rama, but has golden colour complexion.

भ्राता च तस्य द्वैमात्रः सौमित्रिः अपराजितः |

अनुरागेन रूपेण गुणैः चैव तथा विधः || ५-३५-२२

"The invincible Lakshmana, the son of Rama's step-mother and Rama's brother, is resembling Rama in appearance, affection and in qualities."

यः च एष दक्षिणे पार्श्वे शुद्ध जाम्बू नद प्रभः || ६-२८-२२

विशाल वक्षास् ताम्र अक्षो नील कुन्चित मूर्धजः |

एषो अस्य लक्ष्मणो नाम भ्राता प्राण समः प्रियः || ६-२८-२३

नये युद्धे च कुशलः सर्व शास्त्रभृताम् वरः |

"This man, having the radiance of pure gold, with a broad chest, having red eyes, with black and curled hair, standing at the right side of Rama, he is called Lakshmana, who is interested in the care and welfare of his brother, skilled in leadership of combat and excellent among the wielders of all weapons."