as a beginner gud work but not gud enough work as an artist for a job. Experiment more with the techniques like chroma keying, roto, matchmove, rig removal, tracking nd don't use net footage or downloaded project( a suggestion).
Remember 3 things as i hav learnt:
Create - ur own video nd use them. Then see the difference.
some areas to work on:
the girl with chroma in 3rd project- chroma was not properly removed. there was a faint line.
man with wire attached 2 him with car- not a clean wire removal
Athough u hav presented breakdowns well
Decide wat showreel u r working on.
If it is a vfx or compositing showreel then put only pre-requisite work only not photoshop work. don't jumbled it up. Work on packaging
of ur showreel, it help a lot.
Hope it help!!!