Its extremely hard to decide on only 3 pictures, there are a LOT i really really love.
Tried to select 3 now somehow:
End of the Day:
http://www.flickr.com/photos/motheroftwo_photography/3617179997/I love the atmosphere in the picture, like in most of the sunset/sunrise ones.
The Sunset Drama or Burning Sky would be very good, too, if thats a category for the contest.
I didnt find the heavenly lights among the list, but i was very fascinated by them, too.
Very beautiful all. I picked this one because of the mood in the picture: sunset in background,
horses in the middle with shadows and the grass in the foreground. Very peacefully and calm.
Dandelion_2:
http://www.flickr.com/photos/motheroftwo_photography/3616267277/I love the perspective here from below going up the dandelion.
Its sharp and contrasts the background with the sky on top and meadow below.
When i saw it for the first time i thought this must be shot by a professional, you clearly are one
Water Drops :
http://www.flickr.com/photos/motheroftwo_photography/3667908635/Great perspective with the long leave and the sharp water drops in the centre running down it.
I like the selective grashopper and the kiss me im prince, too. They would be great for that category.
There are also a number of flower pictures like the rose heart, shy rose or water lilis or stars i would pick for sure.
Limenitis archippus and Calopteryx maculata are very beautiful insect pictures.
A lot nice ones... i can understand its hard for you to pick a small number.
Its hardly impossible because there are so many great ones. But these would be the ones i would decide on i guess if i had to decide on 3 of them
Best of luck for the contest, you have very very good chances!