It's the landlord's property - and in this case, so are the furnishings. He must give you advance notice to enter the apartment when it's not an emergency, but it is 100% legal for him to photograph his property. He is 100% legal in showing the inside of the property to potential future tenants or to potential buyers of the property, and this can be done by personal showings or through photography/video. You have ZERO legal standing to deny him from doing this. Therefore, because he has this legal right, it does not have to be stated in a lease.
As for the positioning of the furniture...while it sounds unreasonable to say that you can't rearrange the furniture, it would ultimately be up to a judge to decide in court if that is unreasonable or not. The fact remains that it is HIS furniture, not yours. He would have ZERO legal standing to tell you that you can't move your furniture around.
Now, if he didn't want you to move his furniture, he should have stated that in the lease, and if he didn't, that would weigh in your favor in court. If he decided to withhold something from your security deposit, he would argue that it cost him something to have the furniture restored to its previous and correct position, and the photos would help. He would also have to prove that he paid someone to do it; he would not recover anything for the time he personally spent. You, of course, would go to court to protest the charges for the moved furniture, and maybe the judge would agree that it's an unreasonable charge. Maybe not, too.
But he is allowed to take those photos.