1 is too much light, 2 kind of dark, 3 seems fuzzy - so number 4 it is. Maybe you should now take those images and try that stacking software. I downloaded and installed, but have not had time to play with it.
Coins 1 & 3 taken with my Canon point and shoot 2 & 4 taken with IPhone with the micro adapter and all with same lighting conditions all 4 cropped with PhotoScape