I think these are fantastic, Lhune! Very well done; and great for learning. It's nice to see your skills loosened up a bit; makes for very appealing images.
Though one thought, when you said the snow should have had a hard edge; artistically it's actually better to leave it soft.
Jacked from conceptart.org:
In general, edges are:
Harder in the light, softer in the shadow
Harder in bright light, softer in dim light
Harder in focused light, softer in diffused light
Harder in the foreground, softer in the background
Harder on smooth forms, softer on textured forms
Harder on hard forms, softer on soft forms (Duh, but really)
Harder on flat forms, softer on rounded forms
Harder on thin forms, softer on thick forms
Harder on still forms, softer on forms in motion (on moving forms they are harder on the leading edge and softer on the trailing edge)
Harder at the center of interest, softer as you move away
So since your snow looks in decently diffused light, is actually soft, is fairly thick, and in the background; the edge should actually be quite soft.
But yeah. These are great; can't wait to see more! 8D