Styling of the product shot is critical. Yes, again and again: styling and composition.
When Light painting, make sure not to flatten the composition by adding too soft and uniform lighting all over the composition.
When drawing (painting) a background with the light, try to be more gentle with the brightness, as well as try to shape your movements of a light brush
Do not crop too tight, leave more room for subject to “breathe” (again and again). Have room at least 1/3 of the size of a subject on top and on a sides between a subject and the image crop.
When working with glossy subjects like glass bottles, consider to do a multiple shots with separately lit glass and the rest of the composition. Glass won’t looks good with many reflections from a brush, and it can be lit differently
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