Alternativeto.net is a good site for this (Alternativeto.net: OneNote), but I was surprised to see how many of the options don't support images. Would BasKet suit your needs?
I haven't used BasKet, but reviews say it supports images and is the closest option to OneNote.
You can try Basket Note Pads, but it's only available on Linux. It looks very similar to OneNote, the biggest thing missing is being able to write notes with a stylus.
http://basket-notepads.github.io/
Updates still occur at: https://github.com/basket-notepads/basket
There is Xournal++ for writing, but still needs more maturity imo https://github.com/xournalpp/xournalpp