a very sweet story. and as it stands works fine. the points below are me being VERY fussy because, as it is such a lovely story, I think a few tweaks can elevate it.
For a short story it starts at point C, goes to D, then jumps back to point A, before proceeding to B. While short stories do not need to be strictly linear, they do require a strong purpose for the lack of linearity. Here the second part, for me, produces more questions than resolution and, while unresolved questions are a good way to leave a reader pondering, the questions are all about the death of relatives while the MC is so young, and not about the central question of the relationship & why the painting is being painted.
I do love the descriptions of how the painting is formed - to the point that I went and looked up Dutch Master Landscapes, and ooh, there were some beauties.
I have a query re the names. They are Nordic, but the only place clues we have are the reference to Dutch Master. While the two are not exclusive, it would be nice to either have names and reference matching, or a reason for the dissonance. That would be easy to do, eg having a reference to using the Dutch style for a Danish/Swedish landscape.
anyway, hope any of that is useful for further draughts, and thankyou for a lovely story