If the pictures in the doctoral thesis are marked incorrectly, the following steps should be taken as soon as possible to correct them:

Find out the mistakes: check the pictures on the paper carefully to make sure to find the wrong marks.

Correction: once mistakes are found, correct them in time. When modifying, you need to check carefully to ensure that the modified label is consistent with the content of the picture.

Check the full text: After revision, you need to check the full text again to ensure that there are no other labeling errors or problems.

Re-submission: If necessary, the revised paper can be re-submitted to relevant institutions or professors for approval.

Note: If the paper has been published in the journal, you need to contact the editorial department of the journal as soon as possible to explain the labeling errors and ask for correction.