Yes, I am going to tell you “just send the words”. Even if you do send in illustrations they 1) should be rough drafts, and 2) will be evaluated separately from the text of the book.
If your manuscript for a picture book isn’t compelling with just the text alone, then it needs work.
However, there are some exceptions. Though these are rare. Do not count on being the exception. If your manuscript does require illustrations to tell the story, mention it in your cover lover and make sure your story is absolutely superb.