The linework outline of the turtle is very choppy and crude. You might want to smooth is some.

thanks for your comment mossy. the lines are very choppy cause their hand drawn. i left it there to leave the cartoon'ish factor on the picture. like a small fary tale in the real world i think if i smooth them i will loose a bit of that effect.

you could put a shadow under the turtle if you want to ground him a bit (not too dark, just a gauss blurred disk underneath him blended into the grass, also your hand drawn lines are awesome.. (you can see them great in HIGH RES) you might want to think about doing the same thing to the background, trace around the edges of the trees with the same type of lines.. just a thought, something I would do to make it look entirely like a cartoon.. love the shading on the turtle... as always IMHO

EDIT: GREATLY IMPROVED.. it really looks like a story book illustration now.. good luck author and good work!!!

thanks for the great advice Drivenslush! hope you like the new version

nice mixed media,good luck!