Nature/outdoors icons

The Icons:
The theme of my icons was the outdoors/nature. My first attempt was the bear, which followed the Skype idea of using circles to construct a design. I think it went quite well, but it's not super clean so I tried some different styles.
I like the yacht and the tree and how the empty space is a join between the elements, whilst there is nothing there. I like how that works, it looks really clean.
The rowing boat was an attempt to try and replicate the empty space from the yacht/tree, and I think it went quite well. It's not particularly exciting but it's solid.