Why can't I see my abs?

I'm flexing my abs pretty hard in the photo below but I can barely see any outline of abs. I've been cutting for the last month (eating a few 100 calories under 2000 a day) and adding more cardio into my workout (I usually run a mile a day). Are my abs not developed enough or do I just have more fat to lose? Should I reduce my calories even more?
https://imgur.com/a/Qdh06GJ

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