Please bare with me, this is my first official piece of "crit" using the new DA Critique function!

This is a great rendition of Spides, the movement and dynamics in the pose are original and full of life! I love the touches you've added like the glowing eyes and the webbing in the background, they really help to make the piece interesting instead of it just being "just another pic of Spidey"

There are a couple of things I'd watch out for when using this cartoony style; The pose is really dynamic and impressive, but I feel that pictures like this are even more amazing when the poses are believable, for the most part you've done this well but Spide would have to have no hip in order to bring his leg forward like this, - I've seen some pretty impressive things in Yoga classes but this is just a little beyond belief for me! the pose might be more believable if the foot were turned out away from Spide's body more, as it stands we're seeing the top of his leg at an angle where we'd be lucky to see his leg at all. If you flip the drawing (horizontally in photoshop) perhaps you'll see what I mean.

The cel-style colouring is great, punchy and working really well. Some of the edges of the shadows are a little sloppy in places (see the wobble along the thigh, and along the edge of his fore-most finger) and I might be tempted to bring the lighter highlight on his index finger around the top of the digit to pop it forwards away from the shoulder.. - because his finger tip and shoulder are the same colour red it rather just blends into it, but bringing a thin line of that orange around the top of the digit there could really help it to stand proud.

When using a key line (the white line around the drawing) pay attention to any mess on the pencils/inks.. there are a few white spots in here (a couple near his hand) and also some "bobbles" in the line by his left shoulder etc.. the spots could be intentional, but variations on the key line thickness/smoothness can detract from the impact of a strong silhouette like this.

Finally (and this is more a personal comment than one on technique) I feel the blown-up Spidey face in the background might work better if it were blurred slightly... as it stands you can really see the grain of the pencil lines and the pixel edges of the shading, which may well be an intentional commentary on the drawing process, but for me it takes away from the simple/punchy impact of the cartoon style.

All in all a really strong piece, which could be made even stronger with just a little more attention to those microscopic details. - Thanks for sharing, Keep up the awesome work!!