don’t know how I missed this, sorry. WELL done on the PB and performances. 
Re the pics, top one looks like from 100m but see your eyes? You appear to be looking about 10m ahead instead of more in a straight outlook which could be pulling chin down.
Next one plenty (too much) shoulder rotation which is putting your L arm accross your centre line, that is 1/2 way up and it is already there and look how far behind you your R arm is but then in next one it isn’t far enough accross (although aware running the bend), I’d work on getting consistency even practicing arm action in front of a mirror. Try and get toe up before contact.
Over all pretty good though and the final judgment is your times which are progressing well. 