Correct me if I write something wrong throughout this post, but yes... don't merely label language persuasive techniques!
If you wrote something like "the author uses the rhetorical question *blah*" it sounds a bit bland, although you could probably use it once/twice in an LA essay. Change the word rhetorical question to something like "the author imposes a question that if *blah*" or something like that.
Also, I would like to share what I sent to tutor. Said it was great

This is an example (from some LA I wrote) of how I could write an analysis on a sentence (in some article/speech etc...):
- Example
- Technique employed
- Effect on audience/particular audience
- Why do they feel this way? (in other words, why does that effect occur)
- What has the writer done (eg. has she besmirched the opposing stakeholder in her argument?)? Why did he/she do this? [this part is optional, but nice to add.]
Example: [VCAA 2012 exam]... She describes a situation of children without the 'terrible' burden of 'great big textbooks'. Her reference to children may appeal to parents, for they may understand the pain children go through carrying books and such. This is caused by the words 'great', 'terrible' and 'big', which magnify the agony the children endure. As a result, this may evoke a sense of hope for parents that e-books may abate the weight children carry to school. Moreover, children and students alike may feel relieved that their concerns from carrying heavy textbooks are heard due to her use of such adjectives. Elliot's attempt to suggest to parents and children one benefit from e-books has been deliberately added to convey to them that she is perspective and hence feel inclined to listen to her, despite her main contention.
Try to identify the steps that I used in the sentences above. Of course, you can vary the steps (eg. technique -> example -> effect on audience -> reason why effect possibly occurs in audience OR effect -> technique -> example -> reason)