philip - Might be a case of me using incorrect terminology.

I was referring to the not-quite-AA-but-not-quite-dithering on the pants in stan's second pic:

stan, I see what you're saying about the pose, and it does make more sense now. That said, there are still some anatomical issues. With your arm outstretched to the inside like that, there would be more clavicle movement, which would bring the entire shoulder/arm forward. From the angle we're looking at him, that would mean the shoulder/arm wouldn't be sticking out to the right that much. Additionally, legs are still too short. Take a look at the first example in Draco's post for a better idea of leg length (Terry is a mite exaggerated).
Now the hue shifts.
I'll start with images, since my 4am brain can't think of a good way to explain with words (these are referring to the HSB/HSV sliders in Photoshop; click the little arrow at the top right corner of the color pallete, and select "HSB Sliders"):


H=Hue, S=Saturation, B=Brightness (aka V=Value)
You'll notice that as B increases, S tends to decrease (this
can be the opposite, but generally you can stick with this relationship). Also note that H follows a trend as well. If your lights are warm, your darks will tend to be cool, and vice versa. Hue shifting, as you can see, gives you a much more interesting "gradient" to look at than simply altering the brightness and saturation. (third gradient copies S and B from the previous gradients, while fourth gradient only copies B):

At the moment your hue choices are a bit haphazard, with 3 of your 5 shades sharing the same hue, and 2 inbetweens going in opposite directions on the color wheel.
Shading so far on the pants, imho, is still noisy, but improved. Lighting seems off, assuming his left foot is supposed to be further away from the viewing plane than his right (if this is the case, his left lower leg should be mostly in shadow, with maybe some light catching on the cuff of the pants where it's bunching up around/resting on the shoe).
The shirt right now seems to have a couple of folds that make sense, but most of it seems rather random. Again, put on a top that's close to the fabric you'd like the character to be wearing, put yourself in that pose, and get some reference shots. Fabric and drapery are tough, make no mistake. Use reference.

And I swear, if I'm talking too much, please let me know. :p