Does the suitor's saying to the guardian, "I have accepted her according to the Madhhab of Abu Hanifa al-Nu'man," constitute a legitimate contract that permits the fiancée to shake hands with the suitor, adorn herself for him, and speak with him in words of love?

A valid Islamic marriage (Nikah) has conditions and pillars without which it is not valid. These include the guardian (wali), witnesses, offer (ijab), and acceptance (qabul). If the marriage contract is concluded fulfilling these conditions and pillars, the woman becomes a wife, and it becomes permissible for her husband to enjoy her, while observing the custom of not having intercourse with the wife until she is escorted to him (zifaf). The marriage contract is concluded if the guardian says to the suitor, "I marry my daughter so-and-so to you," and the suitor says, "I accept." However, if the suitor merely says, "I accept her," without an offer from the guardian, the marriage contract is not concluded. It is preferable not to mention a specific madhhab (school of thought) in the contract.