Can you describe how Kakasaheb Dixit came into possession of Sai Baba's portrait and what his immediate reaction was?

Certainly. According to Chapter 51 of the Shri Sai Satcharita, Kakasaheb Dixit received the portrait while visiting Kakasaheb Mirikar's house. The portrait had been entrusted to Madhavrao, who, moved by the moment, uncovered it and handed it over to Dixit. Dixit's reaction was one of profound and immediate joy. The text describes that as soon as his eyes fell upon the "all-captivating portrait," he was "overwhelmed with joy" and looked at it with a prostration. He felt extreme delight because the image of Baba, for whose darshan he longed, had appeared right before him on his path.