Interesting...
Well, in addition to what Rox said about shading and all, I'd say you should work on the design of this creature in general. Know what aspects to keep, revise, and eliminate. In those aspects, I think that the original drawing (the one off which you based your revision) had something good going on with its mouth. Tendrily = good monstermouth. You seem to have lost that in your versions in favor of...spikes? I actually like the idea of keeping the fingers kinda wormy. Just make sure that they don't look like an afterthought...For the feet, I picture some oldskool megaman-type legs...all flarey-outey at the bottom. The "waist," just below his big ball...head...thing, is offset towards the right. Move it to the left a bit. It looks like that spot is a bit too weak, IMO. The upper-half is all big and heavy-looking...it hardly looks like that waist would be able to support it without snapping in two. You might wanna consider giving his torso a (fairly) consistent width.
Oh, and you should really take into consideration a strong pose before you start getting detailed and stuff. He looks like he's just standing there all...standyly. Try giving him some menace to his stance, or some action, or something. Also, try not to mirror.
Q: Is this thing alive or robotic?