Maybe try some of the early chapter books that have a few pictures?
Magic School Bus has a chapter book series and usually each chapter will have a picture
the James Herriot's children treasury (they are various stories from his All Creatures Great and Small series)
Mrs Piggle-Wiggle series
Encyclopedia Brown books
otherwise, if those don't have enough pictures, you may want to look for some fairly in depth picture books like "Alex the Parrot" or "Gregor Mendel: The Friar Who Grew Peas" (I find for picture books, non-fiction picture books may be more challenging - we have a lot of those at home and even as an adult, I find them engaging and about people, animals and events I never knew about - for instance one on Charles Drew: Doctor who got the world pumped up to donate blood).
