You don't need to show faces of the team - everybody has right to mantain privacy.
Though it might be good to reaveal at least key person's personalities. Peopke want to know if people who they are investing in are professionals. Crypto is high-risk after all.
Though it may be totally okay not to reveal any faces. Cryptoanarchy is about privacy after all.
If the project wants to attract investment, then the team must be public. Most projects have a public team.