Nothing wrong with finger position dude. Thumb is in a good place, and good overall movement from the wrist. And love the vibrato at about 23 seconds in!
To think critically, maybe think about the different types of vibrato you can get.Wide, short, slow, quick etc. Think stylistically as well. This is a nice slow beat, very mellow, with quite an aggressive vibrato over the top. Explore a more relaxed approach to vibrato. You have those wide vibratos down quite nicely, but maybe think about a slow vibrato.