Dude this is great.

I've got a few more things to add. A white pixel just above frankenshark's right eye along the outline. A grey cluster(maybe more transparent pixels) that goes outside the outline of the leash, it looks out of place since all other grey is within black line art.

Thanks Manu!

Yeah there were def some readability issues in that area, but the solution would of chopped things up a little too much imo. Something to keep in mind for next time. 

Perfect.

Wow! Among other things, the way you pixel these girls' faces so efficiently and economically is masterful

There might be too much detail in the shark that hampers readability: it took me way too long to find her right arm; the shark's left could be read as a grotesque right arm of the witch.
The harness-looking thing which may be around its 'shoulder' is confusing, and so are its eyes.

Thanks for catching that! i had some transparent pixels that showed up here but were hard to see in photoshop.

Really amazing linework as allways. Really love the little hook off of the witch's hat. There is a couple rogue grey pixels on the white background, on the left and right, just a heads up.