Hey Mark.....No idea what size Todd's preview was, so can't say how it would scale....THAT would be a nice challenge though
I CAN give some comparisons to help visualize though.
Cutting another Heart right now for my Mom as she liked my Dad's so much.
The "I Love You" face of the 3" Heart from D&M was "Vladimir Script" with the "Bold" option checked at .45" font height cut
with an Onsrud 30 degree Engraving bit with a .005"flat(37-21)(Ballew Saw has best price and shipping was as fast as Drillman1).
The "Names" were the same bit and it was "Monotype Corsiva" "Bold" option checked at .2" font height and Very legible.
The "Owl" and my signature on 1.75" blocks were cut with the same bit, BUT described as a VBit to get the .98" "Owl" to have eyeballs..and deeper Script at .15" "Vladimir Script" "Bold".
Preview will NOT be 100% accurate...things like the antlers will be .005" narrower for instance, and preview will show Fuzzy because it thinks it's a true point(which disappears when cut), and anything smaller than .005" will be overcut and disappear like tiny Moon dots....everything else will be exaggerated deeper and be more visible.
"Lions"are 1.9" tall, done with the Tiny .25mmR Chinese Tapered BallNose and have some eyes/nostrils/whiskers:)
Afraid even with the engraving bit described as a VBit....Santa and Reindeer May lose their eyeballs, and Moon a lot of detail, BUT Hard Telling..Not Knowing.
You would definitely know what it was though!
Hard,dense,close pored wood would be a must I think?
Be a blast to try...and certainly something special!!
Hope this helps visualize it.
Gotta get back to cutting or it will be a long day:)