Screenshot Trick

Open the file:
My Documents -> My Games -> Smite -> BattleGame -> Config -> BattleInput.ini

Open with notepad

Look for the line TgGame.TgPlayerInput

Add this line under TgGame.TgPlayerInput

Bindings=(Name="MiddleMouseButton",Command="shot",Control=False,Shift=False,Alt=False,bIgnoreCtrl=False,bIgnoreShift=False,bIgnoreAlt=False)

Your Middle Mouse Button/Mouse Scroll Button should now be your screenshot button "in-game", this doesn't work in the main menu... I'm looking for where I should put it but it's easier to type /shot in the menu anyway.

You can change the Key Binding for it. Like C, or Q instead of MiddleMouseButton.

Or if you want to add ctrl or alt, you can change the parameter Control=False or Shift=False to True

Your SC's should appear in BMP form in the
Smite -> BattleGame -> Screenshots -> Win32
folder.

I'm currently looking up how to change this to .jpg but for now, I'm using Photoscape to convert all the imaged to .jpg