There is an intrinsic problem with books featuring food as main character - it´s hard to empathize with a main character whose desire is to be eaten
Jokes aside, I like your drawing style and these look nice and well paced. It´s good practice to dummy a book and you learn a lot of very useful skills by doing that. If I had a critique is that all illustrations are a little “passive” - mostly just the character saying something. You could try to bring in some more movement with different points of view, different crops (maybe a closeup) or some real action.
If you aim to pitch your book to agents or publishers, however, here is some advice I had to learn the hard way: don’t go into the dummy phase with a story idea until you´re completely sure about it. I´ve dummied two books, with all the investement in time and energy, who will never leave a drawer again because the concept and writing are not strong enough - and I could have learned this at the manuscript phase.
Writing publishable children books is really hard and needs about the same commitment as learning to illustrate. You need also to study the market very well, read a ton of books and know what´s out there. For example, I bet there are a million books with the topic “eat your veggies”. How has the theme been handled before? Can you bring a new angle, something different to it?
The best first step is to join a writing critique group, especially if it includes experienced or published writers. SCBWI has some always going on in the various regions, but there are many other options. There are children writing courses (also here at SVS) you can take. And of course reading tons of children books from the writer´s perspective.