I didn't ask permission before including figures in my thesis - now what? I used a number of figures from journal articles in my master's thesis. I cited the sources in all cases, but didn't ask permission (I didn't know at the time that I was supposed to). Many posts on this site recommend asking permission to be "better safe than sorry". In my case, the thesis is already published - should I ask for permission now, even after the thesis is published and for each of the figures?
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.