Sayed... when I view your image, the first thing that hits me is that it is somewhat centered vertically... when I grab the viewing window and lower it until the somewhat horizontal line at the bottom left of the leaf is gone- the image appears more appealing... to me! Horizontally... you might (if you can) give the snail less room behind him and more in front. Enjoy working with your images. :o)
A very good macro of the slimy little booger. :) The body appears to be in perfect focus, though it looks as though his shell is a little blurry. You can deepen the depth of field by stopping down your aperture to a higher number :) Besides that, very well done! Have a great day!