I am a plain looking Asian guy as you see.

我是一个普通的人,像你看到的样子.

Xiao Li was a talented girl, but quite plain-looking.

小丽是个才女，但是相貌平平。

Though plain-looking, Mary is possessed of great intelligence.

虽然相貌平平，玛丽却拥有智慧。

Though plain-looking, they are possessed of great intelligence.

虽然相貌平平，但她们可能拥有着大智慧。

He was short, and, well I don't want to say homely, so I'll say he was plain looking.

他个子矮小，而且，我不想说他不好看，所以为只能说他看上去很一般吧。