A glance at the provided charts
Since you did not provide a copy of the charts, I cannot accurately consider the information you are providing. The image reference is too generalized for the examiner to get a better idea of how the information is being presented to the writer. Always identify the type of image. If it is a chart, indicate if it is a bar chart, pie chart, columnar chart, or what have you.
striking differences
No need to exaggerate. You are being asked to write an accurate depiction of the information in the summary presentation. The examiner knows that exaggerated references will never be part of the presentation. Though such references add life to the report, you are not writing a creative paper here but an academic review. The need for flashy descriptions are not needed nor required.
It is obvious
Again,, there is no image attached so what is obvious to you, is not obvious to your reader. Do not make these sorts of references because it does not make you sound smart. It makes you sound annoying instead, which is not a tone that should be found in an academic paper.