Hi Massimo,
it looks very nice! I would consider following:
1. brown color a bit lighter, bw photos show lower contrast between brown and "dirty green" than your bw picture,
2. outline of the national insignias should be thinner an of the same blue color like blue part of insignia. It was may be painted in the thicker layer with a thin brush, similarly to sometime "darker" red outline of the VVS red stars after summer 1943,
3. AFAIK roof window between cockpit and nose gunner was clear, so it should look more like window over rear gunner position (very nice clear & glossy). Window in your picture is too milky/foggy. But may be I am wrong.
And then, if you do not mind, I would post it at Czech modelforum to see reactions & comments.
Regards,
66misos