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Basically, the usual situation is that she comes sometimes to force me into drawing some original, non-pony things over photographs, and I reluctantly do it.
This time, we got in a serious argument because of cartoony lines that are supposed to indicate motion. The general idea was following: one worm throws a book, other gets hit, and book rebounds off his face.
For some reason, she seemed almost furious because of my initial arrangement of those lines, based on what I usually saw in comics. She insisted to drop it in favor of a different arrangement, which seemed completely illogical to me.
Below you will find both versions, the top one being mine, and the bottom one being my mother's. Which arrangement is better? Which expresses the concept more clearly? Which is more logical and why?
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Yours conveys the individual movements of hand, book, and face, and that's good.
On the other hoof, hers focuses on the motion of the book, which also makes sense.
Personally, I would recommend using very thin lines for the movement of the hand, just as you did in the first example; then use thicker lines to emphasize the book's trajectory. For that, I personally would have both thin and thick starting together (perhaps drawn parallel to and alongside each other), then splitting apart as the book leaves the hand.
Hope that made sense, and that it helps.
The first looks to awkward. Although it accurately describes the motion undertaken, the three arcs look too cumbersome, and take away from the drawing instead of emphasizing the motion. I can see the intent in the first one, but it doesn't sit well with me.
The second looks more streamlined, and takes less away from the picture. However, the motion undertaken is different from the intended effect. While the intention is to show a hand moving to throw a book, and the book flying into the face of the other worm, it looks more like the book feel from some unknown place and bounced off the lowered hand of the "throwing" worm. The differentiation between the two movements is indicated in the first picture moreso, so the intention that there are 2 different actions is clear.
If I were to propose a compromise, perhaps a combination of the two styles is in order. Make a more streamlined gesture of action lines signifying the movement of the 1st worms hand (as in the 2nd picture), but separate this movement from the action of the book flying into the face of the other worm (as in the 1st picture). This si, of course, only a suggestion, so feel free to do as you please.