I am currently learning cello after playing violin for about 7 years. I was self taught on violin for the first few years but I eventually took lessons with different teachers. Now I am taking cello lessons off and on via skype.
I was watching youtube videos about playing cello and in one of them a teacher was explaining vibrato to her student and demonstrating exercises. In the comment section someone said "You can tell that the student played violin before". That suggested to me that there are things that people who played violin before do that look or sound awkward on cello. I am aware of some things to look out for like
Violin players tend the place their thumb too far to the right of the neck like on violin
Violinist's vibrato tends to be too narrow and fast for cello.
What else should I be looking out for? I discuss this with my teacher as well but there is no such thing as too much information.