COMPOSITION... Mostly favorable composition... I would have loved to have seen this against a more solid background..white or black, to go with one of the snake's colors. Would look less like its shot in the house also... Might also be nice to get more of the snake in a more coiled or windy position, but like this is good also!
TECHNIQUE... There is a little details lost in the shadows. Perhaps your monitor does not show this but I try to keep mine calibrated. This could be fixed in photoshop if the information is there, or by exposing the shot a little more, but I wouldn't go much more. Focus is also not as sharp as it could be, perhaps due to the wide aperture. I tried sharpening the image in Photoshop and it does help the focus somewhat. Every image always needs a little sharpening :) Only thing left would be the slightly uneven lightning on the background. If you ever find this to be a problem in natural light, try using a reflective surface to bounce light back into areas that may not be lit properly. Overall though, its still a compelling and effective shot of a snake.
Never thought I would say it, but that's a cute snake. The colors and lighting in the snake are fantastic. Focus on the snake is good. The background totally distracts from the snake. Maybe try some different colored papers - white, purple, black. Please post some more shots in different backgrounds - this is a great subject.
Very cute! A nice photo. Great focus, but it seems like the whole photo would have been improved by a different colored background, the background you employed is the same as one of the colors of the snake, which lessens the contrast.