If you disagree with what was kept from your security deposit you would write what is known as a "demand" letter, demanding what you believe you are fairly owed from your security deposit and giving the landlord/management a certain amount of time (say, two weeks after they receive the letter) to provide these funds to you.
If no response (or a response that you do not agree with) then your next step is to consider filing a lawsuit for these funds. Such lawsuits are usually handled through Small Claims court as they involve relatively small amounts of money in dispute. Your pictures would be your evidence to show the condition of the rental at move out.
Gail

