Is looked an abstract noun

No, the noun 'look' is a concrete noun, a Word for the physical appearance of something; a Word for the expression on someone's face.

An abstract noun is a Word for something that can't be experienced by any of the five physical senses; something that can't be seen, heard, smelled, tasted, or touched.

The Word 'look' is also a verb: look, looks, looking, looked.