I love love love Hilda and the Stone Forest by Luke Pearson (Flying Eye/Nobrow, 2016). My kids love it too. It’s the richest, funniest, and most heartwarming Hilda book to date.
Pearson manages to stuff The Stone Forest with miniature epics and minor gags, which he hangs on the central story of Hilda and her mother in an otherworldly (literally), uh, stone forest, where they encounter trolls and other dangers (including existential despair).