Thanks. Love to go there and look at it in the Museum one day. 
Due to dispute about either "renovating" the old National Museum or investing in new building,Museum doesn't work for more that 10 years now and nobody knows when will it start working again...
Some parts of the collection were sent for exhibitions all over the world,mostly Japan in recent years...
Apart from this portrait of Olga there were many other royal portraits(such as the portrait of Queen Marie's aunt-Infanta Beatrice of Orleans,King Ferdinand of Romania) that were gifted to the museum by the royals themselves...