I really love the kangaroo!!! I think I might like to see the background less blurred, though those kangaroo cuties probably move pretty darn quick! :-) Colors look very good. I might suggest cropping out a little at the bottom where the yellow seems very bright.
You have succeeded in shooting a kangaroo in very optimal position! However, I would prefer more panoramic form. The messy wood distracts quite a lot and takes attention from an animal. Moreover the pic is too saturated. But I like the atmosphere.
3 - In my opinion, this is about the roo and not the 'landscape'. The potential seems to be there for a good landscape shot (with or without the kangaroo), plus what landscape is in this shot, is blurred, out of focus and, in the foreground especially, seemingly 'blown'.