今天讀到一篇測驗，文法實在看不太懂，求助文法高手。
句子如下:
While painting actual models, he will demonstrate how to improve skills in
making people painted in canvas seem more three-dimensional.
(手機發文一直被跳行，不好意思)
這邊seem這個動詞作用的主詞是誰阿?
是how to…
還是people painted in canvas which seem more dimensional?
實在不太確定，有請開釋，謝謝…