I've done this before with personal photographs. Best filter I used was a similar snow scene in front of our sugarhouse using the drawing filter. It turned it into a colored pencil drawing. Very cool effect.
Blueberries are very acidic. I've experimented with taking them off the lees at different specific gravities to counteract this phenomena. I'm still not decided on which SG makes for the smoothest wine, but I believe it's somewhere between 1060 and 1040. As Scooter68 has mentioned, there can be...