hi there acacia,
hope your enjoying the learning process and don't feel like your fumbling in the dark too much!
all the below is of course just my opinion - if you disagree, then do it with style:
have you tried #1 in B+W - i quite like the way the detail of the trees fades out into grey in the top half of the pic, but there's a lot of foreground that doesn't do much for me (snowy field)
#2 is nice, good colours, good composition, (its a bit soft in the bottom right though - have a try with larger aperature #s, they adjust the depth of field)
and yeah, #4... nah not for me sorry!