Wow what a fun trip for a Harry Potter fan, and a fun read for anyone who likes good writing and photography! Very quality post, followed you and looking forward to more.

I have a tiny piece of constructive criticism that of course you should take with a grain of salt appropriately sized for an alien eyeball that is offering you, a complete stranger to me, advice on the internet ;)

While your photography is awesome and fun and adds a lot to this post, I think the image dump in the middle was a little too long to then resume your post on the other side. After these words, "There is so much more to tell about Diagon Alley, but I think I’ll let the rest of the pictures speak for themselves now" I count 40 (!) pictures in a row before your text resumes. I would personally advise putting such a large image dump (if you feel you must include that many pictures) at the end of the post after you wrap up your text, interspersing the best and most relevant pictures to your text throughout the text itself and dropping the huge mass of pictures at the end of the post so that the reader can read your post and then look through the rest of the pictures if they want to. I would also advise (but this is more of a matter of personal preference) sticking at least some of those photos in a table so you could have 2 pictures side by side and reduce the scrolling. If you don't know how to make a table with HTML, Steemit uses "markdown" which is a simple code language for fromatting posts, and if you Google "Steemit markdown tutorial" you should find plenty of great tutorials on using markdown (you can create tables in markdown pretty easily).

Please understand that this friendly advice does not diminish the fact that I loved this post tremendously and think it is an absolutely exceptional post for any poster, let alone your very first post. Great job!

Cheers - Carl