The Prophet (peace and blessings be upon him) said: "When one of you proposes to a woman and is able to see of her what pleases him and draws him to her, then let him do so." Sayyiduna Jabir (may Allah be pleased with him) says: I proposed to a woman of Banu Salimah. I hid among the palm trees, then I saw of her what pleased me, and then I married her.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 13487