My return to Spriters resource (now VG resource)

[TheMario360]

You may want to add a shine on the coin so that it looks more appealing (for lack of a better word).

See the shine on the upper left of the coin? That's what I'm talking about, if that makes it easier to understand.
But anyhow, it's a stylistic choice, so you can leave it the way you have if you wish.

I added the lighting effects and I have to say, it made them look even better.