You know, Slawek, I feel cheated

- you keep saying you're a poor painter while this mini is pretty decent (especially if you still consider it a WIP)
The parchment and the freehand are very good, as for the first freehand this is much more than I would expect. As for my suggestions - some more highlighting wouldn't hurt. If you manage to het it subtle and not overdo it, highlighting the cheeks and the nose would be a good thing. Maybe also some outlining of the edges of the shirt with a slightly lighterr color?
Maybe also highlight the edges of the UZI?
You could also wash the white on the puppet with some shading color and quickly wipe the wash away, even with your finger. This should provide some easy and effective shading.
Generally a good choice of colors, and better technique than I expected!