Hands Again

Man, I feel like I ruin so many good drawings with bad hands!

Here's two drawings, one of me copying "famous" hands, and one trying to build my own based on form.
In case the print is illegible, the hands are (clockwise from top): Dexter from Dexter's Labratory, Johnny Bravo, Robin from Teen Titans, Pinky, and Tom (as in , And Jerry). I tried to take some hints from both the Preston book and from some online tutorials. Thank you YouTube.