If the finished work doesn't match the drawings and description, your project lead can reject it. You'll see the reason on the job.
What it costs
Each rejection charges 5% of your share of the job from your wallet, and costs points. If your balance is too low, the rest becomes an amount owed. A rejection also means the on-time bonus is lost.
Putting it right
Fix the work and resubmit it with new photos. A job can be rejected up to 3 times. After the third rejection, the job closes and can no longer be resubmitted.
If you think it was unfair
You have 48 hours from a rejection to dispute it from your Points page. See How do I dispute a points deduction?.