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Based on the straight line scratches, it appears you were sanding by hand.
It is common for small particles to become trapped beneath your sanding paper and the paint creating deeper scratches that we call tracers. This is usually a result of not using enough water, not cleaning the paint often enough, and not cleaning the paper out often enough.
I would start again with some 3000 grit paper and level these remaining tracers properly. I would not expect compound to level the amount of texture I see remaining in your photos.
Be sure to completely clean the paint prior to beginning the sanding, and be sure to continue to rinse the paint and paper frequently to ensure there are no particles that may gouge the paint while sanding. Use light pressure, too!
Good luck!
-Zach
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