Is there any source, halachic or otherwise, for an aversion to having one's picture taken?
The Gemora (Rosh Hashana 24b, Avoda Zara 43b) writes that one may not make a portrait of a human. The Rishonim argue whether this refers to only protruding images (such as a sculpture) or extends to non protruding images such as photos and drawings. Shulchan Aruch (YD 141:4) follows the opinion of Tosfos (Azoda Zara 43b "Vehu") that it only refers to protruding images, however the Tur there quotes the opinion of the Ramban who is forbids even non-protruding images.
According to the opinion that the prohibitions includes non-protruding images of people, one would not be allowed to take pictures of people (Maharam Shick YD 170, Zekan Aaron 2:47, Am Hatorah 3:5 page 59). Based on this opinion, some people are careful not to have their pictures taken, and do not hang pictures of people in their homes. (Da’as Kohen YD 66, Divrei Malkiel 3:58, Levushei Mordechai YD 1:86, Darchei Teshuva 141:35, Nemukei Orach Chaim 243 page 112 (old), Yaskil Avdi YD 2:11 Kuntres Achron, Vayivorech Dovid 1:100, Maseei Ish 1:page 29:33, Teshuvos V’hanhugos 3:263, see Shevet Ha’Levi 7:134:5 who is unsure).
See this edition of Halachically Speaking for more on the subject. [There is what to rely on the be lenient, the question asked for a source for being strict.]