I am new here, not ready to post sketches but here are some of my reference photos, they are very large high quality but shrunk to fit here nicely.
I hope that some show some good art I love photos so I am looking for some tips
This is poor photo edit, trying to make it stand out nicer
I use TagMonkey Image host. ( http://imageshack.us/ )
Other then that my comments for your pictures...I love your lake side images. ( I think it is a lake ) As for the carnival I am not to enthused by em' but the picture under the roller coster is sweet.