Thanks to all for compliments.
madamalouise - yes, perhaps I wrongly planked back of ship, I decided to place strips vertically on all vertical parts (I do not know why). But in this stage it is very difficult and tough to re-plank all these parts. It not only plate on stern, but on the stem I did it in the same way. All structures between decks are also made by vertical placed timbers
Ok, I leave it as is now, on possible second build I will use this knowledge.
Regarding to keel, I used plywood one and cover it by 0,5mm walnut veneer. The result is good - keel looks in the same way as hull, only keel is 1mm thicker. I tried to sand it before placing veneer, but is was very hard and I did not sand it enough
Thanks for your suggestions, it is very helpful.
Regards,
Michal