Story goes that he was pretty good ad drawing buildings but not that great with people.
"He took the two day entrance exam for the academy's school of painting. Confident and self assured, he awaited the result, quite sure he would get in. But failure struck him like a bolt of lightning. His test drawings were judged unsatisfactory and he was not admitted. Hitler was badly shaken by this rejection. He went back to the academy to get an explanation and was told his drawings showed a lack of talent for artistic painting, notably a lack of appreciation of the human form."
Here is some background
https://www.quora.com/Why-was-Adolf-Hitler-rejected-from-the-Academy-of-Fine-Arts-Vienna