Have you tried checking out other H scarf listings from reputable resellers? You can get a good sense for what to include from those.
A few suggestions (though I am no expert):
- include the name of the design in the listing title. In the description, you could include some information about the artist, the design itself, etc (you may have to research this)
- include the colorway as described by H (french, with English translations)
- condition (detailed descriptions, photos of any flaws). If it's NWT, it should look the same as you'd see it in the boutique (eg, crisp folds)
- where it was purchased (and if it was an H sale item, note this)
- include a photo of the care tag
- what it comes with (eg, box, ribbon, tissue, copy of boutique receipt, etc)
I echo good life's comments about the pricing - depending on how rare or sought-after the design is, some design command a premium but others don't. If it's a relatively new design that's still available in boutiques, you'll probably need to sell it for less than retail. However, if it's an older design that's no longer available in stores AND is very popular, you may be able to charge a premium.
Hope that helps, I'm sure the more seasoned experts here can also chime in!