how a woman
    who is previously married should get married
Question

                I am wondering how a woman who is
      previously married should get married, i.e. how does she find a husband, does she require
      a wali, how does she meet the husband-to-be and when in the process. Can he see her face
      and hair and when.Please show all proofs using Qur'an and
      Sunnah JazakAllahkhairunPlease tell me who is giving this fatawa
      and their islamic Background
Praise be to Allah.The case of a woman getting married again is something
    that God has predestinated and is a success granted by Him. This matter could be fulfilled
    by: (Doaa) praying to Allah to provide her with another husband. By the guide of
    charitable people for a suitable man. By one of her female friends who knows her status
    and mentions her to one of her relatives, also this could be the fruit of philanthropic
    project for achieving marriage relations considering the state of the man and the woman
    and what is suitable for every one and is controlled by trustworthy faithful people.
And as for the guardian, it is a must no matter the woman has been
    married before or not. The prophet (peace be upon him) said: Any woman who gets
    married without the permission of her guardian, her marriage is false, her marriage is
    false, her marriage is false.[Narrated by Al Termithy # 1102, Abou Dawood, Ibn Maga
    & El Albani said that it is authentic in his book Sahih Al Gamia #
    2709 ].
It is preferable for the person proposing (for the first time) to look
    at the woman he is proposing to because the prophet (peace be upon him) said:
Go and look at her [Narrated by Muslim # 1424]. 
And for what Al Nasaee narrated: Al Mugira Ibn Shoba said:
    Someone proposed to a woman at the time of the prophet (peace be upon him) so the
    prophet asked him: (Did you look at her?) He said no. He said: (look at her, by doing this
    it will be more likely to have a harmonious marriage with everlasting love.[Narrated
    by Al Nasaee & others, El Albani said that it is authentic in Sahih Al
    Gamia # 859].
Most of the scholars agreed that the man proposing for marriage is
    allowed to look at the womans face as it is the place that gathers all the charms,
    and her hands (their face and back), i.e. she should appear in the same state as in her
    prayers.
This should be without staying alone with each other in a privet place.
    And without touching one another. He may look, in their meeting, at her more then one time
    as long as he needs this, until he decides if hes going to marry her or not.