Yes, there are a couple of options for changing the colours used in the line graphs. To try these options, select 'Chart views' in the upper right-hand corner of the Charts page on the Realeyes Dashboard.
The options for changing line colours are listed on the left-hand side.
For any required colour customization beyond the pre-set options, you are able to export the raw chart data and re-create the graphs using Excel. To do so, select the data you would like exported using the Emotions and Demographic filters on the left. Then select 'Export' in the upper right-hand corner of the Charts page.