@gary-wilkinson Looks great!
I think the route is similar; however, given the simplicity of many board books, you may consider creating a series of books (that's something that has been on my mind to work on). Take a look at Jane Foster's board books (they're great! My 6-mo old son (and my wife & I ) loves her Animal Sounds one): https://www.janefoster.co.uk/books/
I like that you removed the text from the images. I don't think that the text needed to be added to the portfolio images displayed. Now, if you were to be showing a set of flashcards or pages from a book, then I'd include the text, but showing these as spot illustrations, I don't think the text is all that necessary.
For licensing, you'll probably end up developing a paper/textile series of offerings to present at Surtex or the Licensing Show (or at similar expos) or to get a licensing agency to represent you. either way, there will need to be a catalog of imagery ready to be licensed. I'm assuming a paper/textile pattern series catalog since you are not licensing a character brand (e.g. Hello Kitty) or a story brand (e.g. Spongebob) as far as I can tell.
Great work! Fun to see!