Hi Suzaane,
OK. So if I'm reading this post, you already sent the query out? If so, what's done is done. But this is my answer for future queries: If you are not an author/illustrator, which it sounds like you are not, then do not send sample illustrations. Your words are enough. Editors and art directors are pros. If the book is well written, they will "see" what the illustrations might be and they will hire the illustrator to do the work. Yes, you said that the illustrations you sent weren't contingent, but including illustrations not intended for the book is not the norm and it likely shows your inexperience. Which is fine. Everyone starts out new and makes a few mistakes! :-)
In addition, I would recommend finding a critique group to review your text instead of relying on your patients as "authenticity readers". While their opinions may be helpful , getting the input from other writers, people who understand the craft of writing a PB, will improve your text immensely.
I hope this helps! And I thought your illustration was cute.