Yes, communicate with the teacher and correct it. The picture title error is not serious, which will not affect the reader's understanding, the paper will pass and defend, and the external review will pass. However, serious mistakes will lead to confusion and misleading understanding, which will affect the examination and approval of papers and the results of defense. When the title of the picture is found to be wrong, communicate with the tutor and the thesis defense Committee in time and ask for revision or correction to ensure the accuracy and standardization of the thesis.