This is the last part of "material sources".
If there is more I'm not aware of their existence, or just cant get information without buying additional literature or driving to museum somewhere.
found this in meantime:
Zadar 14th century
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Now lets look into neighborhood a bit:
Gothic frescoes from Istria (place called Beram, 15th century work of "Vincent from Kastav").
Istria, while partially inhabited by Croats, was never part of Kingdom of Croatia (of Hungary) but HRE.
There are late gothic frescoes in northern Croatia (Petrovina, Martinščina ...) but they are damaged.
I have detailed description, but and I can't find good enough pictures.
A bit from Bosnia
So that's it for research, now I will update my unit recommendations to reflect all information gathered