After my last project I decided to do something a bit different and remake an area from one of my favourite games - Rare's Banjo-Kazooie on the N64.
I figured the first place you start would be the best place to start - Banjo's House. An indoor, small-scale environment.
I added a very subtle variation on the sobel edge detection around objects. Essentially making the lines just a slightly darker hue of the colour behind it.
It just makes things 'pop' a bit more and i think it suites the haindpainted style.
There is also a Mario Galaxy style effect on objects where they have a soft fresnel outline to accentuate the toony effect.