Excuse me, can graphic designers be skilled immigrants?

Yes, as long as he can score 5 points in speech, it is no problem to find an employer as a guarantee in advance. If his speech is not enough, he can stay in Australia as long as he can find an employer as a guarantee. Speaking is generally necessary, but it is also beneficial. If he is doing business or investing abroad, his speech requirements will be much lower. Anyway, you can go to "official website, the Australian Immigration Bureau" for details, which has a detailed introduction.