Pagination over method parameters not working

I have checked your website.
Pages with people tag throws 'No photo' message on page number 4 and above.
This is due to the following hard coded value in the above code.
$pager['total_rows'] = 200;

Dynamically count and set total rows like this.
$pager['total_rows'] = $this->photo_model->count_by_tag($slug);
(You may know this already because other pages programmed perfectly).

"Everything is Possible in the world of Computers"