Hi @carzy , replying here as the Review thread is meant to just be for reviews so you have an easy reference for finding them if you want to talk about a particular review you’ve written in a different thread. It also allows us to keep a record of our reviews in one place.
I’m going to direct you to @Ian_Chimp 's Reviewing Reviews which has loads of helpful tips in it. In addition, @Blonde_Bunny 's 
The Review Writing Routine is a topic that has great advice in it for writing reviews.
If you’re happy to post a few reviews and ask for constructive feedback please do so, I think people here will be really helpful.