You're not too far off, your light and white balance are good. Just need to improve your focus and then crop the pictures.
I'm no pro but you don't need to be to take good coin pictures for web use. I use an old Canon SD700IS ($75), it's only 6MP, and a $30 desk lamp from Lowes. Then I crop with Paint Shop Pro ($10 or less) and resize to about 800x800.


It's good enough for web use:

Lincoln Cent Lover!VERDI-CARE™ INVENTOR
https://verdi.care/