1.It is a matter of trial, the IO's report is not final neither you can disprove it at this stage, you ma have to get them nullified only during cross examination of IO.
About the photographs, it is not admissible as primary evidence unless it is supported by a certificate under section 65B of Indian evidence act, hence don't strain over it now itself.
2. No criminal case will be entertained against the police for this, the report given by them is not final, you can get them falsified during trial proceedings.
3. This alone cannot be a ground for quashing the charge sheet, you may have to rely upon the factual incidents that took place between you both during your married life and highlight her acts of cruelties in your memorandum of grounds for quashing the charge sheet. The statements made before police are not any reason to rely upon to quash the charge sheet, they are actually not reliable statements or reports, they can be dealt with properly during trial proceedings, hence don't get excited over it at this preliminary stage.
4. These cannot be the reasons for quashing the charge sheet.
The grounds for quashing the charge sheet will be based on the complaint and the contents of the charge sheet.