Dave,
I'm thinking you are in a place where we all spent time when we first began to use a scrollsaw. It was a pretty humbling moment for me - but I did get past it. The answer you are looking for includes research (on this forum), experimentation and most of all - practice - not necessarily in this order.
I want to emphasize that it would be a pretty rare person to produce a work of art on their first try ....
Since your scrollsaw is not a variable speed then think of using some different blades, some different feed speeds, and some different woods - do some straight lines, some curved lines, some tight turns and some circles - with each - you will very soon gain the knowledge and the skill you need - and the circle you have shown will become a perfect cut.
.... and ....
.... assuming you like what you are doing .....
.... you will find yourself saving for a variable speed saw .....
Jay