Is it permissible to ask Allah for the highest paradise by His Noble Face, knowing that the Messenger of Allah, peace and blessings be upon him, forbade asking by Allah's Face for anything related to worldly matters?

There is no objection to this form of supplication (du'a), based on the statement of Imam Al-Iraqi concerning the permissibility of supplicating and requesting something by the Face of Allah. This is further supported by noble prophetic narrations about the Messenger of Allah, peace and blessings be upon him, seeking refuge in the Face of Allah, as well as in the verse, "Say, 'He is the One Who has the power to send forth punishment upon you from above you'" (Qur'an 6:65), and seeking refuge is a form of supplication. As for the phrase "neither disgraced nor tempted," it has been authentically reported that the Prophet, peace and blessings be upon him, used to supplicate with it.