Illegal(?) Political Advertising - misuse of WA coat of arms

First, a disclaimer. Although a long-term resident of the City of Vincent (since 1985), the recent changes to electoral boundaries has shifted me from Perth into Mt Lawley. Clearly, the electoral commission has the same lack of appreciation of 'community of interest' as the Local Government Advisory Board - Mt Lawley south of Walcott Street is very different from Mt Lawley north of it.

Nevertheless, I retain a close interest in the state seat of Perth - and the main candidates clearly support me in this, as I keep getting literature from both Eleni Evangel and John Carey - as well as, correctly, from Simon Millman and Michael Sutherland, candidates for Mt Lawley.

It has previously been reported that Eleni Evangel, member/candidate for Perth, has chosen not to use the Liberal brand in her billboard advertising - although her fliers do have the Liberal brand prominent.

What I do not recall seeing mentioned, however, is that she IS using the WA Government brand/cost of arms (see pic). Is this legal?

http://www.watoday.com.au/wa-news/second-proliberal-billboard-adorns-lisa-scaffidi-building-20170303-guq0mz.html

And while on the subject of political advertising, can we reduce visual pollution by restricting candidate-specific advertising to the candidate's own electorate. The billboards above are in the Perth electorate and Michael Sutherland should not inflict himself on all and sundry.