It is correct and usable in written English.
You can use it to describe someone's appearance when they are deep in thought. For example: "She looks focused on the problem at hand."
Adams, in blue, looks focused.
Almost invariably, each performer looks focused, attractive, sincere.
7.41pm GMT Clack-clack-clack... Out march the teams, led by their respective phenomena: Ronaldo looks focused, pent-up and dashing; Ibrahimovic is smiling, relaxed and has his hair done up like a sumo wrestler.
Paddy Considine is a frowningly vigilant Banquo and David Thewlis is Duncan, the sacrificial victim King smilingly presiding over the nation which sometimes looks focused on a pagan court and sometimes in a vast Christian cathedral from a later age.
Instead, the young actor looks focused on carving his own take on the character — he nods to the Han we know but then builds a performance rather than an impersonation.
Tellingly, there's no explosion of emotion from the Spaniard - he just looks focussed and determined.
Another technique, called automated perimetry, uses a bowl-shaped instrument into which the patient looks, focusing on a central point.
Scene: Scene looks focus on hair.
He looked focused, and a little tired.
He looked focused and was trying to keep his emotions in check".
