有一种结构A of B that定语从句，比如下面这种，的先行词是A还是B,Can you believe that I won the photo contest with the conglomerate of the two pictures that was most esthetic, even though I only tried to hang them where there were nails.这个句子里面的先行词是conglomerate还是pictures

pictures

根据你（应该已经听过的）本吧第一名师（weibo.com/iqlake 微博名@喵大翻译 ）的课：http://www.yizhibo.com/templates/html/valuelive/valuelive.html?id=846
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定语从句的构成公式是
I know the girl. + The girl comes from Beijing. = I know the girl 【who】comes form Beijing. 或者 The girl 【who】 I know comes from Beijing. 先行词 = 从句引导词 = who = 两个原始简单句的相同名词 the girl.
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所以，Can you believe that【动词后引导宾语从句】 I won the photo contest with the conglomerate of the two pictures that【名词后且位于be前做从句主语，定语从句，修士pic，that本身就是相同名词pic】 was most esthetic, even though I only tried to hang them where there were nails.