It all depends on the actual toner coverage (how dark and dark+saturated the photograph is.)
If I'm looking correctly the hp laserjet cp1525nw takes the following cartridges:
HP CE320A black rated for 2,000 pages at 5% coverage
and
HP CE321A cyan, HP CE322A yellow, HP CE323A magenta, each rated for 1,300 pages at 5% coverage.
Note that the page count for each toner is 5% coverage on an 8.5" x 11" sheet.
Note also that there are degrees of blackness. For example, in a graphic you might have a black square which is 100% black and 0% cyan, magenta, and yellow. This will look black, but it can be darker black if it were rich black, 100% black plus a percentage of cyan, magenta, and yellow. In a photograph if you have very black areas depending on your settings and the photograph you will be printing black plus a percentage of cyan, magenta, and yellow for those areas.
You can run programs to actually calculate the coverage - for example there is a 30-day demo of APFill Ink & Toner Calculator which allows you to input a pdf and tells you the actual toner coverage area.
http://avpsoft.com/products/apfill/