I want to make improvements such as having in shine and having the "P" pop out or something. Any other ideas are welcome, too.
I am very, very new to Inkscape, and pretty new to graphic design altogether. I'm not really that great of an artist in the first place, so I'm still having trouble with seemingly simple shading.
Some example versions are below -


The coins have a "P" because of the website I'm going to put them on, which is not completely put together as of now.