That extended arm is anatomically a bit of a mess. Both arm and hand, especially hand. The fore leg too, isn't working on knee. Look into the underlying muscle and bone structure. Your intent to have sleek contraposted curves as seen in the far shin/leg is undermined by the otherwise cramped pose. Lack of definition on face. Gray (close to zero sat) is a Majick kolor alright, but I think you're overusing it here. dithering is a style choice, but one that would contribute a lot to this piece, especially styledithers on the clouds.
