Hello Holden.
I hear a slight slur in the 's', 'sh', and 'j' sounds that you might want to clean up a bit.
e.g. 'student', 'just', 'most', and to a lesser extent 'British English'.
That might have nothing to do with your English, though. It could be a question of dentition, in which case don't change anything (if you are trying for an English English accent, that is).