Still not enough gravity to enter the Officer Corps. He would have to go to one of the Military Academies to become an officer and his being an artist seems to preclude that.
...
That’s a possibility. The architectural elements of his training at the Institute may be enough to ‘stream’ him to the Engineers.
My grandfather was born in the same year as Hitler and studied at the Academy of Fine Arts Vienna from 1907 to 1911. He then went to Munich, where he refined his painting techniques by copying several masterpieces in the Alte Pinakothek art gallery, then in 1912 to Paris, where he did the same at the Louvre, and finally to Algeria, where he took part in the conservation and restauration of frescos in early Christian churches, which had been white washed over, when said churches were transformed into mosques after the Arab conquest. After my grandmother lost her first child on the ship from Marseilles to Algiers, she forced my grandfather to give up his bohemian artist's lifestyle, return home and find a job to support a family, so in 1913 my grandfather became an arts teacher at a secondary school in a provincial town north-west of Prague.
When he was drafted into the Austro-Hungarian Army in the Great War, he was immediately awarded an officer's rank, since he had an academic degree, regardless what kind of degree it was. I'm not certain whether it would've been the same in the Bavarian or any other German army, but I can imagine it would. So if Hitler had finished his studies at the Vienna Art Academy, he would also have become an officer in the Great War. Now, what kind of painter would Hitler have become? Taking into account his personal dislike for post-impressionist modern art, a notion he shared with my grandfather (
unsophisticated finger painting - not Hitler's words, but my grandfather's) it's pretty safe to assume, that he would've adhered to traditional academic painting styles, which might have made him moderately successful economically in the interwar period, but wouldn't likely have earned him a place in any art museum later on.
Regarding politics, the fact, that Hitler came into contact with Anton Drexler's DAP, by being sent there to infiltrate it by the intelligence department of the Reichswehr, would near certainly be butterflied away ITTL. That's not to say that Hitler wouldn't still harbor pan-german and anti-semtic sentiments ITTL, but he might be content to share them only with his nationalist parlour revolutionary friends. He might of course still become active in one of the many
völkisch parties or political movements, but the perfect storm that made him head of government IOTL is extremely unlikely to repeat itself here.