What’s the best thing to do with the strap if I want to highlight the bag itself and still show some part of the strap?
If the bag already has too much design, you can place the long strap behind the bag and style it in such a way that the strap doesn’t add to the “noise” of the image. But if the bag has very minimal designs and details, you can show a part of the long strap in front. Note that you have to carefully style the strap so that it complements the shape and form of the bag.
Because you specified that it’s a handbag you want to photograph, there’s nothing wrong with not showing the long strap at all. Just make sure the handle stands firm and is in perfect shape. If the color of the bag is different from the color of the strap, you might want to highlight the color contrast by including part of the strap as well.
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