Personally I have contacted the first or authors directly and asked them for permission and most of them have replied within 2-32–3 days. Also my librarian had advised me to refer to a listing of journals and their policiesSherapa/Romeo (a listing of journals and their policies). Some journals are very lenient and wouldn't mind using images if you have explicit permission from author. Important thing to note is once journal is published, the author waives away all his rights and only journal paper has rights on the work.
Wrzlprmft ♦
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Corrected capitalization & spacing. Reformatted link. Minor copy editing.