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The sandbags are from Tamiya, and they are WAY too smooth. I'll try the medical guaze next time: I couldn't figure out how to get that "texture" into them. Thanks for the feedback!
Those Tamiya sandbags are a pain in the neck, but they are good for starters.
Just look at some REAL sandbags for inspiration :
1) there's no space between them. In scale, you can fil the space with putty, clay or another filler.
2) they never look shiny or smooth. You can add fine sand, cement or another powdery solid substance in your paint for texture. Make sure your paint is matt. You can add a flatting agent to the paint for that. Stay away from the medical gauze an small scales like 1/35.
3) why not get a slab of clay and model your own ? Wear rubber gloves to avoid your fingerprints on the final sandbags.