It is odd that in the third screenshot there is no visual differentiation between the true and false blocks of an if statement. That's one place where I still kind of regret the genericness of Lisp syntax.

Perhaps place a green outline around the true block, a red outline around the false block (if any), and indent them both slightly or otherwise connect them to the predicate block so that the connections are clear.

Of course one issue with treating constructs like if specially is that in Lisp you can create your own macros that act just like if but then don't get the special visual treatment.