Any expert can start using Experty app. Our goal is to create the mass-market consulting product, so everyone who has an expertise in any field will be able to use it.
Blockchain stuff is just one field on which you can start selling your knowledge via Experty, we are not limited ourselves to any special field. Experty is created to help any knowledge workers/influencers/experts to monetize their time/knowledge/expertise on global market.

Here's the example usecases:
https://www.experty.io/img/mct-graphics/en/usecases.png

Answering your question, yes you can start selling your expertise in photography via Experty.