Wow, these have so much personality! Beautiful renderings. I love the line weight you've chosen, but if I were to be picky, maybe the drawings could have more diversity of line weights. Specifically on the characters with clothing. I think you could tune down some of the bolder strokes on the clothes and choose to go bold only on the areas where you want to bring the viewer's attention OR in moments where there is one form overlapping another to give us a sense of depth. But I love your creativity with these! solid understanding of the forms and proportion. There's an amazing book by Patrick J Jones called Drawing from Photos that helped me understand how to correct for camera-altered proportions. In the Rastafarian mouse photo, the lens is clearly foreshortening the mouse too much, I found that if I can correct those proportional things, I can have a better drawing. For that one specifically, the far leg and the lower body should not taper quite so much as the photos suggest. The lens that was used created a stronger taper since it was likely shot on a wide angle while very close to the subject.

Okay wow!? This looks great, your drawing from imagination is truly incredible! Keep going!

This turned out incredible @luc_! Really not much of a critique but I really like how you made the bottom of her hair and the shadow that going into the collar one shape -- I think that idea it would look nice applied underneath the chin also instead of having her neck outlined by the white line. You could use the light color of the lining of the collar to break up the shapes and give her neck more form.