I suggest to keep my settings, and do not change the size that much (if you want to make it smaller, please keep in mind that you might will need to add a bigger hole - not too close to the edges).

The settings are for M1 10W machine; I used 3mm pine plywood.

I decided to add one layer of stain, so it will work well to bring out the original wood design a bit. (Unfortunately mine was a bit too dark, and I couldn't see well the engraving part, so next time I will use different tone).

I am using fine-tip markers to paint this little flowers.

I started with the leaves, then I decided to use black to make the design stronger, and marked the lines.

Then, I used red for the poppy flower petals.

2 small rings and an earring hoop will be needed for each of them, and you are ready to wear your new beautiful earring set.