The free version is - as always - ad free, beautiful and fully functional but most settings are locked. The full version has loads of settings including the dynamic real time mode where lights, sun, moon, stars, colors, clouds changes according to the time of day. You can also set fog density, snowflake count, tree count, tree size, snowflake size, snowflake shape, select different backgrounds, change the ground level, change snowflake weight (make them fall faster/slower)... And much more.
Trees: Frank Kovalchek & Newton-Syms
Mountains: Zach Dischner
Forest: mahalie stackpole
Moon: Luis Argerich
Snow on cypress tree by Rosendahl