1. Braiding with thread looks really good, so its really handy to know how to do it.
There's plenty of videos on Youtube, but I think this lady actually has the best plaits.
2. I'm guessing you're getting ready for the show season? First of all, keep your pinto rugged. Then, use a whitening shampoo each time you wash her. The one I use is called White Glo? I think and it comes out a pretty deep purple. At the show, use bady powder or chalk on her.
3. Don't overbrush it or wash it. It strips it of its natural oils that promote growth and fullness. Prevent her from itching it, if she's an itchy pony. Use a tea tree shampoo or something with tea tree in it. Use a tail bag.
4. Getting a mane to lay flat naturally takes a bit of time. When its wet, push it over all onto the side you want it and flatten it with your hands. Brushing it will cause the hair to break and its often very tangled whilst wet. Use skinny hoods and neck rugs whilst in the paddock.