These drawings are cute and eye-catching. I see that you are confident with your lines and shapes, and you have very good control, too, thus bringing your characters and objects to life while adding fun to them at the same time.
I personally feel your first two drawings - ones with purely outlines, without cross-crosshatching, aren't as strong or interesting as the others; they feel too controlled, to rigid, and because the line weight and value is the same all over the place, they don't provide any focal points. The others are masterpieces in comparison. I feel that your drawings are at their strongest when the lines are lose and with some patches of values. (For example, the pear.)