"looks splendid" is correct and usable in written English. You can use it to describe something that appears to be in excellent condition or very impressive. For example, "The new library looks splendid.".
That looks splendid from Athens.
He also looks splendid in tweed.
John Madden's picture looks splendid - how could it not?
I can see that the text looks splendid.
He looked splendid.
Ali looked splendid and triumphant.
In any event, the British capital is looking splendid.
I love the desktop app, it’s always running on my Mac. Ludwig is the best English buddy, it answers my 100 queries per day and stays cool.
Cristina Valenza
Retail Lead Linguist @ Apple Inc.