It's a pretty good clone, but you can see the area where it was done. Especially if you tell us an area was cloned and we are looking for it. LOL You definitely have the hang of it.
Not sure which software you use. I use photoshop 7. Heres my touch from your touched up image, not the original. Best thing to remember when cloning is there are usually another piece of something you can use to match up over an area to fix an image blemish. as for this image might be somewhere else on the snake to cover and help match up.
Here's my clone effort. Took about 10minutes of cloning to get this far. Sometimes it helps to enlarge the image to work on the patch and some might be better working at regular size. The minor defects you have fixing large (say 150% or so) can be un-noticable when the image is reduced back to its normal size.
Or bring the color across like the original in the clone area.