I (looked at) (watched) the picture (but) (and) I could not

I (looked at) (watched) the picture (but) (and) I could not (understand) (realize) it.It was in black and white and was (called) (named)‘Trees and snow’.I could see (neither) (not only) trees (or) (nor) snow.
looked at but understand named not only or
最后not only ...or 有这种说法吗?不是应该说成not only ...but also吗