I disagree. I think the iconic 1960s Dylan is the most important and recognizable photo to have heading the article. This is a matter that has been discussed here before, and I think the last discussion settled on the 1960s Dylan to head the article. (Which is not to say that, given the right photo(s), the discussion might not go the other way this time.)  There are more recent photos further down in the article; perhaps they could be given more prominence. And yes, you are correct, it looks like the lead photo is just a cropped version of the photo with Joan Baez. This isn't ideal, perhaps it could be fixed by changing one photo or the other.