Disclaimer: This is just a guide to give you an idea of what your coin might grade. Often coins will grade higher on one side vs. the other. In example, it's possible for a coin to grade G4 on its obverse, but grade VG8 on its reverse. Also, this guide is not a claim that one's coin will obtain any grade listed if submitted to a third party grading service.
1793 Flowing Hair Half Cents mintage was plagued by poor copper planchets and striking issues. If you compare the EF45 example, in the images below, with the AU55 image then you might think they're backwards or mis-graded. However if you look closer you will see that the AU55 has sharper features but was struck weakly on the hair. The hair is one of the high points of the design.
Now, look closer at the EF45 image and you will see wear even on some of the lower relief design features. Furthermore images often make it difficult for grading a coin and light reflections can fool the eye.