thanks neota, you have totally right, sounds better like this :) ... well I need to update this picture

Modanung -> by hand ( two ways, one with a 1 or 2 pixels pen and another with a custom made brush (4*4 pxl))

Did you do the dithering by hand or did you use a gradient tool in 'diffuse' mode?

A quick edit which shows roughly what I mean:
http://img.photobucket.com/albums/v449/neota/edits/tntg.png

the sandy texture is conveyed very well. The shadow of the TNT stick needs some parts of the shadow faded, if it's supposed to be daylight -- you've accounted for the light falling on the top of the stick, but not the light that falls around

From http://en.wikipedia.org/wiki/Shadow
"For a non-point source of light, the shadow is divided into the umbra and penumbra. The wider the light source, the more blurred the shadow."
You have drawn the umbra without the penumbra.