Is this question correct?
Would you please send me the pictures of number 3 and number 4 explained (listed?) in the email before the the last one?Note: They are providing housing options in 4 different locations, and he sent me the locations.Thank you in advance.

Hamid,I am not sure I understood the context of your sentence, but I will leave you a suggestion that might fit in this case:"Please, could you send me the pictures of houses number 3 and 4 by email prior to the last one?"