1) and 2) suffer from distracting backgrounds. Take shots outside, to get rid of the unsightly background, and also to get more flattering lighting (especially in mornings, or early evening, when the light is warmer and not as harsh). Try and refer to the rule of thirds, to make your composition more pleasing. 2) isn't in focus, as well.
3) and 4), the deer aren't quite in focus, and the twigs and branches in the way are distracting. Try to get closer, I know it's difficult, but then the deer will fill more of the picture, giving you less wasted space.
5) I like, but you have a difficult situation here. You have the sky, which is bright, and the snow, which is white. Your light meter exposes for a grey: when you point your camera at a white wall, it does all its calculations expecting a grey one, so you need to increase the exposure in order to accurately show the white. Likewise, when you have a black wall, you have to decrease the exposure.
So, in this scene, to get the white of the snow, you have to increase the exposure. This, however would have blown the highlights in the bright sky, meaning you lose detail (you have actually blown the highlights in the sky a little). You could have waited for the sky to darken a little (I guess this was close to sunset) or used a neutral gradient filter to selectively darken the sky, but not the snow.
Anyway, well done, and it looks like you've got some beautiful scenery to try out your camera on!