My second sketch after completing Realistic Drawing course! Feedback welcomed!

This is my second sketch since completing the Realistic Drawing course with graphite pencils. I’m proud of it, but I know it can be improved. Specifically, I had a lot of trouble with the outline because some of the lines were actually white highlights rather than true lines in my reference photo.

How should I have approached those? I’d love this community’s feedback about how my sketch can be improved and what techniques/skills I can work on to become a better artist! Thank you so much!

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Kelsey, it has been impressed upon me to “pump up” the values. I still struggle with going darker. 2nd, remember there are no lines only changes in value. I am sure others will be more helpful as I am only a sophomore.
Jim