Car looks clean, after your own inspection if you like it then before finalizing do get it inspected by pakwheels , its just 2k rs i think (what's 2k when you are spending 12 lacs of hard earned money) but you will have peace of mind, they will tell each and everything about car in inspection report.
If engine is good then don't think about overhaul etc, after buying the car just change all fluids , filters , maybe sparkplugs or brake pads if required and you are good to go.
I more thing 1.3 vitz are less because they have extremely low resale, the tax bracket is higher and not many people want 1.3 in small hatchback .