Hey, these are nice for a beginner! I am somewhat a beginner also, but these are pretty nice compared to most...
One, is pretty nice, but I would have tried putting the house in the lower left hand corner to get rid of the tank thing, and to show more rainbow and to get rid of the some of the ground. I think it might be cool to make it a little more 'simple' also..I like the animal ones too; however, I would have tried following the rule of thirds, and putting their eyes in one of the intersection points.
1,6, and 7 also look like they could use some more contrast in my opinion..
Cool pics!