Ok so i spend way too long looking at that image, so here is my analysis. (Sorry if it has already been done)
The books in the shop give you a good preview of what to expect! There is:
Pride and prejudice (in the pile of books), a story about two characters who unleran their biases in order to get together.
Treasure island (also in the pile of books), who tells the reader that looking for gold is futile as gaining wisdom and righteousness is more fulfilling.
A tale of two cities (the book aziraphael reads), a book that has themes like the possibility of renewal, the necessary of sacrifices, the violent nature of revolutions, social inequity and justice.
Catch 22 (on the bookshelves, beneath "closer"), where the protagonist can't escape his situation due to all the regulations in place. Its also used to say that if you want to fight the rule, you first have to accept it.
Other details that may be of note:
Two lizards on the table, one blue/green, the other one orange.
The old camera that reporter aziraphale had on the leaked pics.
A matchbox on the table (i might be looking too much into it, but it looks to me as if there is a saint's picture on it and a verse where you strike the match).
At least 3 statuettes, on of a roman soldier, two of women (including one who's seemingly sheltering herself from a danger above. Shes on the windowsill where golden/heavenly light falls from above..).
The clock face, that looks like it's frowning. Plus the clock seems broken, there's only the big needle and its on 6.
Aziraphale and Crowley seem to influence each other, they take on opposite colours where they touch. Aziraphale is slightly darker as if there was a shadow on his arm, while Crowley's back is in the light (i dont count the light on his face, as realistically it is a promotional poster and you need to be able to see the actor's face. Plus on his back it looks more like "heavenly/ethereal light").
So it's been speculated before that season 2 would be about them fighting hell and heaven to be able to be together, and it looks like it's what we are going to get. There might be a rebellion that has other angels and demons fighting their sides, inspired by the freedom that aziraphale and crowley seemingly got. Im guessing that they'll also have to reflect on their beliefs about the other one and about themselves as they were "enemies" for so long. They may have to re-enter their old sides and may have a really hard time escaping (they might not totally escape..). The statue might be protecting herself from heaven, but the lizards could be demons and the sad clock indicates 6, that has been linked to the number of the beast. I firmly believe that they will get together in the end.
(Disclaimer: I havent read any of those books, heres the sources for the informations on pride and prejudice, treasure island, a tale of two cities, catch 22. If anyone more knowledgeable could add any wisdom it would be great!)
Other things I cant entirely see or explain:
There's other book titles that i cant read on the shelves, but they might be purposefully greeked.
The shop front saying "give me".
There's a portrait on the table, hidden by the camera
There's journals behind the register
The CD/vinyl next to the clock