There were 2 changes to this design. Did you catch them both? The obvious change was the replacement of the single ring on the outside of the chain with a cloverleaf. See how much of a difference it made? The first one looks naked in comparison and the denseness of the rings around the outside of the motif makes the negative space created by the chains really stand out.
Did you notice the other change? The chains on the first motif have 3 picots between the inner ring and the outer ring. The second motif has only 2.
Could you figure out what the stitch count was for the cloverleaves? If you guessed 3, you were right.
If you didn't, take a look at the inner rings. You can see that they are the same size in both motives and I told you what the stitch count was for the first snowflake. Now look at the rings on the cloverleaves, see that they are the same size again?
When I'm designing something flat like a doily I tend to stay with the same kind of stitch count. It means that in drawing software I can start with one ring and just keep pasting it. The design is uniform so I don't have major adjustment headaches. Not only that, when someone tats the design they can enjoy the process instead of having to check every ring to make sure they have the stitch count straight. I have used different sizes in a design especially where shaping is an issue. I just don't usually.
Designing isn't hard and the best way to get into it is to do something like this. Start with a known design and change just one element. Then use your new design and change one more element. Eventually you have a totally new pattern.
Here's the pattern for the second motif. How close did you come?
Next - Number 3 are you ready for the challenge this one presents?
Edited 2016: The purpose of posting these simple designs was to get people thinking about how designs are created, but over the years beginners have commented, asking how to tat these patterns and where to start. So I have now uploaded a modified version of the diagram, with the starting point marked and arrows for the direction of tatting. The shaded rings are tatted with the second shuttle. This should make it easier for beginners to tat.