I agree, very nice collection.
I would suggest for consistency use the full phrase 'postal card' or 'picture post card' (depending on the item) rather than mixing those with PC or PPC. Also I'd refrain from abbreviations like that because I personally don't think you should assume anyone is going to know what you are talking about. Clarity is best.
I was also going to mention that cancelled is spelled with two 'l's, except I realized you were a Yank, and you folks prefer the single l version
Also ( just noticed this ) watch your line breaks. That's how you break up a sentence. Keep dates together - example May 11 1934 and October 31 1953 in the second image.
And 2 1/2 pence in the last image.
Sorry you asked now, aren't you.