Installation:

Note: If you're paranoid, you may want to back up your Content/Portraits and your Content/Characters folders.

To install, simply drop the unzipped content folder into the game's main directory.
It should automatically prompt you to merge. Say yes and replace the files.
The files that will be replaced are...

Portraits:
    Bachelorettes:
    Abigail.xnb, Haley.xnb, Leah.xnb, Maru.xnb, Maru_Hospital.xnb, and Penny.xnb.

    Bachelors:
    Alex.xnb, Elliot.xnb, Harvey.xnb, Sam.xnb, and Sebastian.xnb.
Overworld Sprites:
    Bachelorettes:
    Abigail.xnb, Haley.xnb, Leah.xnb, Maru.xnb, and Penny.xnb.
    
    Bachelors:
    Alex.xnb, Elliot.xnb, Harvey.xnb, Sam.xnb

If you're manually installing (for specific characters), portraits are located in Content/Portraits and overworld sprites are located in Content/Characters.

If you don't like the look of a certain character, either don't replace that one, or re-replace it with your backup.

Hope you enjoy.

Overworld sprites are edited by GianTDIX. Thank you for doing that!

-Rupert484

Changes to 1.2.1-
-Adjusted Leah's phone portrait to look less awkward, and actually give her a thumb

Changes to 1.2-
-Adjusted some of Abigail's overworld sprite to have a more smoother shine on her hair
-Fixed the incorrect walking bounce on Leah's and Maru's overworld sprite
-Given Leah her phone portrait

Changes to 1.1.2-
-Fixed some issues on eyebrows once again where color gradients weren't smooth
-Fixed some pixels on near eyes and foreheads that were colored wrong
-Fixed issue where half of the expressions were a pixel off to the right
-Centered everyone to the best of my abilities
-Updated preview picture to show newer versions of the portraits

Changes to 1.1.1-
-Reworked all bachelorette eyebrows to make them seem less like they were drawn on with MS Paint
-Tweaked Abigail's surprised expression
-Tweaked Haley's happy and blushing expressions to look less evil and a little more sweet
-Combed through all of the overworld sprites for semi-transparent pixels that I missed
-Fixed Alex's white rectangle above his head in his normal front facing sprite
-Fixed Alex's tiny white squares around his head in his football animation
-Now include GianTDIX's overworld sprites in the preview picture

Changes to 1.1-
-Tweaked all the portraits to make them equal quality
-Replaced Haley's portrait with a more fitting and matching one
-Leah's overworld sprite is different
-Bachelors now have new overworld sprites (minus Sebastian, as his is already fine)