Trump charges that was the case. As the BBC reported yesterday:
President Donald Trump has pilloried an envoy who testified in the impeachment inquiry, claiming she refused to hang his photo in the US embassy in Ukraine.
Mr Trump told Fox News' morning show former ambassador Marie Yovanovitch "didn't want to hang my picture in the embassy" in Kyiv. [...]
"This ambassador, who everybody says was so wonderful," Mr Trump said, "she wouldn't hang my picture in the embassy.
"She's in charge of the embassy, it took, like, a year and a half, two years." [...]
"The standard is you put the president of the United States' picture in the embassy," he continued. "This was not an angel, this woman, OK?"
But I'm not seeing any reaction from those accused (the former ambassador or embassy staff) or any other attempt to confirm or disprove this claim in that BBC article. So, to what extent is it true what Trump charged?