Actually, asking that question flatters me, so thanks! 
Not much to say since it was just a quick greyscale painting, but...
Painted the sketch in Adobe Photoshop CS2 with the default brush (The solid circle). Started by making the background grey, sketching out the image with a low opacity and flow brush and blocking out the shape and shadows. I then block in various details when I am happy with it and believe it is consistant. I then go in for both dark shades and highlights by making a "slashing" movement (much like crosshatching) with the default brush with back/dark greys or white/light greys.
Basically, just block out the shape and shadows and then slowly make progress to detail.
Not sure if that helped, because I hardly understand myself. So, next time I dab into Photoshop for a large painting, I'll make sure to take some WIP shots of cetain stages.
Edit - I think I used the smudge tool a couple times to blend some of the shadows in this one, by the way.
Not much to say since it was just a quick greyscale painting, but...
Painted the sketch in Adobe Photoshop CS2 with the default brush (The solid circle). Started by making the background grey, sketching out the image with a low opacity and flow brush and blocking out the shape and shadows. I then block in various details when I am happy with it and believe it is consistant. I then go in for both dark shades and highlights by making a "slashing" movement (much like crosshatching) with the default brush with back/dark greys or white/light greys.
Basically, just block out the shape and shadows and then slowly make progress to detail.
Not sure if that helped, because I hardly understand myself. So, next time I dab into Photoshop for a large painting, I'll make sure to take some WIP shots of cetain stages.
Edit - I think I used the smudge tool a couple times to blend some of the shadows in this one, by the way.