Chinese Zodiac Pattern Of Coins

What are the problems with these two coin photography works? Is there a bad aspect of photography skills?thanks.

zzve...to your question about the images, my critique would be:

both images are excellent, but there are always areas to improve:

- they are both cropped too close to the edge. better to leave a little space to improve the presentation
- the first coin/medal has parts cropped off. better to include them in the image unless they are really big and distracting
- first image is a little washed-out. increase contrast a bit or lower black level.
- second image is showing some features of the surface (flow lines). proofs with flat and shiny fields are usually shot with as black a field as possible. adjusting lights to eliminate the reflections might help, or adjust contrast/black level to push the fields to black.