what are my options?

[ChicagoTenant]

I just moved out of a Chicago apartment (1 bedroom). The apartment was handed over to the owner after a walkthrough where I handed the keys to the LL and we identified 2-3 issues such as crayon marks on walls and cabinets. There was no written document of issues identified. the LL has deducted 1.2 times the rent from the security deposit. my questions are:

1. can I be held liable for problems not identified in the walkthrough?
2. is there a limit on the amount the Landlord can deduct from the security deposit for a 1 bedroom apartment?
3. Can I go to a small claims court even though there is nothing in written as to what was agreed during the handover?
4. The LL has sent a list of corrections he had to do, but the expenses are not broken with each item. Is he required to give a breakdown?