I didn't ask permission before including figures in my thesis - now what?
I am not sure that one is supposed to ask permission to reproduce a picture from a book/article in their dissertation. From academic point of view, an citation is necessary and sufficient to properly acknowledge the source - otherwise it would be plagiarism.

IANAL, but I don't think there are any copyright issues here, since your thesis is a non-profit academic publication and a relatively small quote from another academic source should be normally treated as a fair use.