Which Ones? - My photoset on Flickr

The photos for the contest... My county is having an Amateur Photographers contest for residents of this county, the catagories are Black & White Rivers/Coast, Color Rivers/Coast, Black & White Wildlife and Color Wildlife.

So which ones should I choose? I'll be adding more as I take them, please help me choose which ones to make black & white & which ones to keep color & what ones for the contest!

Here is one example:
Please tell me what you think.