When I read this strip, I have a strong sense that we are now firmly in the era of classic Peanuts. The characters are solidly of that style, as opposed to the
early or
modern styles. There's still some evolution left to occur within the style, everything becomes just a little simpler over time and the characters get slightly more realistically proportioned, but we're mostly there now I think.
Two things that really drive this sense home for me. First, the theme and writing of the strip are solidly of the classic versions of the characters. We haven't really seen a crabby Lucy yet, but Lucy was never an
entirely angry little girl, she has good days even in her tyrant years. And second, Charlie Brown's eyes when facing the reader, here, seem to be closer together than we've seen recently, which was the major thing about him that still harkened back to the old style.