Does marriage in a foreign country prevent the niqab and require the wife to uncover her hair in official photos, and undergo a medical examination by a foreign doctor, even though it is preferable despite the presence of temptations?

If you are capable of marriage and fear temptation (fitna), then marriage is obligatory upon you. There is no sin upon you if the law in your country compels you to what you have mentioned. What is required of you is to take the initiative to marry to avoid anticipated violations of Islamic law.