Prints available at 
Artist website (mirrors at 
Pixels and 
FineArtAmerica), 
RedBubble.com, 
Society6.com.
Licenses for commercial use - at 
Shutterstock.com, Marketplace.500px.com.
This snowflake was captured in March 25, 2013, along with many other excellent crystals - and without any traces of melting! Such good for snowflake photography, cold weather is not typical for late March in Moscow.
This snow crystal, though looks like "traditional" snowflake, is quite unusual: it is big (around 6 millimeters from tip to tip), but have very simple shape for such large size. And if you look closely at two upper arms, you can notice that they are slightly differs from four others; examining the center of this crystal in 
full resolution tell us that this crystal is typical example of 
split plate snowflake. You can find great description of this type in 
Kenneth Libbrecht's snowflake classification.
For this picture, i've captured 8 identical RAW photos in short series, and 
averaged them to boost signal-to-noise ratio. Background: dark woolen fabric, natural light (grey cloudy sky), external optics Helios 44M-5.
Here is another example of split plate snowflake, which i captured on glass surface with LED back light: 
Crystal of chaos and order:
Here is variant with blur background:
Prints available at 
Artist website (mirrors at 
Pixels and 
FineArtAmerica), 
RedBubble.com.
Licenses for commercial use - at 
Shutterstock.com.
I used this variant as square tile in collage 
Under the grey sky with three other snowflakes (
Rigel, 
Leaves of ice and 
Alioth):
Also, this snowflake available as 
Ultra HD wallpaper:
And here is another large crystal that i've photographed same day - 
The beauty of imperfection - with one reduced arm, but gorgeous pattern in the center:
If you want to see more snowflakes, you can browse through 
all snowflake pictures.
And here is article about 
snowflake macro photography.