Graphite & Charcoal Cat Portrait

This is the graphite sketch of a cat name Vartz that I have just started. It is a 50th Birthday gift for his person and it is a rush job so not sure how many posts I will do of him before he is finished due to the time. I darkened the graphite sketch so that it is easier to see online it is much lighter on the paper. I added more detail in the sketch than I usually do as he has so many stripes in his fur and the photo is a little dark so I don't want to get lost as I go.