Can a bailiff take pictures of my house without my permission?

Yes

Taking pictures of debtors' homes is not part of the statutory enforcement procedures to recover unpaid debts by taking control of goods.

The law doesn't prevent anyone taking pictures of homes from a public place.

A bailiff must not pursue a course of conduct which amounts to harassment of another, and which he knows or ought to know amounts to harassment of the other,^[1] is guilty of an offence,^[2] and liable on summary conviction to imprisonment for a term not exceeding six months, or a fine not exceeding level 5 on the standard scale, or both.^[3]

This type of offence is called stalking.^[4]

Any person who is or may be a victim of the course of conduct may apply for an injunction restraining the relevant person from pursuing any conduct which amounts to harassment in relation to any person or persons mentioned or described in the injunction.^[5]

^{[1] Section 1(1) of the Protection from Harassment Act 1997
[2] Section 2(1) of the Protection from Harassment Act 1997
[3] Section 2(2) of the Protection from Harassment Act 1997
[4] Section 2A(1) of the Protection from Harassment Act 1997
[5] Section 3A(2) of the Protection from Harassment Act 1997}