Here are a few suggestions foe OotP:

there are 2 subtle moments where you can see that Ginny still has a crush on Harry, maybe you can make them a little bit more obvious for example by music cues or zooming in
in the beginning you could make a transition shot where you go from happy Harry with his GoF Hair to a depressed Harry with OtP Hair (maybe even add a haircutting sound effect to make it seem as he changed his hair because of the traumatic events)
make the scenes with Grob darker to hide the bad CGI
when Harry is told that he has to go to court you can add a small moment where Harry get a flashback of the meeting for Karkaroff
add most of the deleted scenes except for the treylawne one
try to get rid of the “you are not like Voldemort” message of this movie, its cheesy as hell and was already featured in Chamber
HBP music for the love scenes
already include some of the Deathly Hallows Snape sequences when Harry gets into his mind
add Sorcerers Stone music for the last scene where they get to the train to make a little callback
the cloud effect you did at the beginning needs to be reworked a little bit