Cat like animal fishing, found in Arlington, Va

I've found that most of the stones I find have a human face on them, I'm thinking it's to honor or it's the artist. This one has a large female in it. [You must be registered and logged in to see this image.]
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What specifics indicate tool marks. I have most of pics.

Thats actually very difficult to answer, flake removal is the key feature, and repetition of the same is the very basic technique recognized in flint tool assemblages, however just because we don't  have neat little scale effect flake removals, it does not mean flakes were not deliberately removed. Bulbs of percussion and ripples and cited in books on the subject that these are indicative of human agency in flint, however this certainly does not rule out items in flint that do not show these features. Parallel linear flake removals are a great indicator of deliberate agency as probability almost completely rules out such events could happen randomly, coupled with an even patina or no determinable difference thereof in the patina would also indicate that those flake removals happened in one proximal time period.

This does appear to show human agency, and also could be interpreted as the elephant front half motif, often described on my blog. Turn CCW 90 degrees, motif facing right.
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Thank for the reply and info, in learning daily from reading the posting on this site. Do you have any suggestions on how/where I can educate myself. I'm clueless to where to start, I've been collecting since I was 14, never paying much attention to detail. For the last 5+ years I see art everywhere in nature.

Probably best to read everything on https://eoliths.blogspot.com/ You can view the older posts by clicking the very small arrows (if on computer) right near the bottom of the page, best information specifically on figure stones anywhere. If you want information around the subject try the rock art museum, it is very comprehensive, link found on the right of my eoliths page, the other links there are also very useful, some very good articles in PCN, and why you should not believe the textbooks on evolution, and Origins has lots of figure stone finds from other older researchers and papers from the author James Herrod. I would steer clear of Alan Day and Richard Wilson, both are liars, and deceivers, They wont Sue cos they Know its the Truth.

Thanks again

Your welcome, please share more of those thumb and hand shaped finds if you get them.

I got loads of rocks and photos all over the country

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I often think the art in our rocks and stones teach us through improving the art of pattern recognition....skrying...however you wish to call it.

I can now see their art whenever they want to show me.

They especially like my tea towels