Help out a newbie GM with pages

So when my players are talking to an NPC for an extended period of time I would like them to be able to see the character rather than just the map. Is there a way to make the .png a page so I can switch from the map they are on to the picture of the NPC? 

I would suggest checking these two posts out:  Quick and Dirty Slide Show and Image Display Scenes Macro for Theater of the Mind

There is also Supernotes, which can put a token or avatar image into chat. If you put an image into the gmnotes of the token or character in the form of: [any text](imageURL) You can also display an image that is not in your library.

So the best looking option was to take the portrait from my library and add it to the map layer. Then I resize the image to its original pixel size. Then I go to the page settings and resize the page to the same dimensions. This creates a page I can move the characters to that is a portrait of the character with Roll20 filling in the back ground with like color to match. Its much cleaner than the any of the previous suggestions I have been reading.

That's an interesting way to change the picture. I'll have to try that if I can find that map tool bar. 

How about creating a handout with the NPC and asking one of the players to take notes in the player section.  It won't force them to look, but it might help, and if the assigned player misses something, The rest can mention it.  It will not show GM notes to assigned players.