Deduct travel expenses from tripif photographing scenics & submitting them to stock photo businesses?

I’m a retired pro photographer and want to travel (with my husband as assistant) and take photos to submit to stock photography companies. Scenics, local cultures, wildlife, etc.
How much of my travel expenses can I legally deduct from my USA income tax? Opinions? Experiences?

Universal Travel to raise $20M with stock sale

Universal Travel to raise $20M with stock sale
Universal Travel Group priced an offering of about 2.9 million new shares on Wednesday at $7 each, bringing total proceeds to about $20 million before expenses. The Chinese travel services company plans to use the proceeds to fund recent acquisitions. It… Company – Stock – Travel agency – [...]