You probably know thereās a beautiful, Caldecott-winning book called Snowflake Bentley about another early snowflake scientist.
Hereās a site: https://snowflakebentley.com/
The book: Snowflake Bentley (book) - Wikipedia
And a video from PBS which begins by talking about him and dives into the science: The Science of Snowflakes - YouTube
To stay scientific, the main thing is to make sure those snowflakes have 6-sided symmetry! That PBS video gets close but doesnāt quite get to what it is about the H20 molecule that gets it to grow in 6 directions at once the exact same way. If you find a good explainer about this, please share!
I also just found this handout a public library put together for making snowflakes in Tinkercad. I think the team at Autodesk had some educator workshop about this a few years ago I went to.
TurtleArt is sometimes used for snowflakes, and there are lots of remixable snowflake projects in Scratch.