Great job!
#1
Looking good, Sunset scenes in my opinion are harder to get to an amazing status because it depends so much on the atmospheric conditions...and having a great scene helps too...around here I have cornfields
#2 - my favorite
I really like what you have going on here, its a cool pic and tells a story. You can almost feel the monkey wanting to get out, especially in his eyes! I like how the hand is blurred from the depth of field, but if I had to get picky I would say that its a bit too blurred. In the future if the situation arises you can close the aperture (bigger number) to reduce this. (unless he was almost touching the camera

then you would need to step back and zoom in a little. Also an interesting effect would be to focus on the hand and and slighty blur the body of the monkey. None the less a cool pic.
#3
Also a cool one, looks like there talking to each other. I would maybey try and focus on the brown monkey more, looks like it might have focused for the fence, you could select spot metering and aim for a patch of brown or manually focus.
#4
Kind of blown out in areas and a little overexposed, Pretty colorful looking through. One thing though I would defiantly switch your color-space mode to Adobe 1998 RBG rather than srgb which is what its set on now, converting it over to srgb in photoshop made a large jump in color. especially with the greens.
#5
To much clutter in the foreground to really do anything
#6
Much better, and a vibrant looking lizard

Still some foreground clutter, I might try to swing around to the camera left a bit more. Also see below
Since your profile says ok to edit I thought i'd make a tech test of the #6 pic, they where composited together on photoshop, taken from a screencapture of the photo opened in PS then converted to adobe rgb. On some pictures you can't tell a difference on others the difference is dramatic. greens and bright oranges seem to be effected the most.
You might have to look into your manual to adjust this but on my D80 you open up the menu then shooting menu (camera icon) then optimize image, then custom then color mode, then choose "II (Adobe RGB)" Though I don't know if they work in auto mode, and when in portrait mode etc.. I think it uses its own profile. Alternatively they can be changed in post processing in a program.
If you want basic editing functions for free check out
www.irfanview.com You can resize and convert to differant formats, crop etc... They even have a plugin to use photoshop plugins (including free photoshop plugins

)
Keep up the good work and make sure to post your next venture!