Hi Lulu,
It is fixed now. First of all, well done. You have drawn some difficult markings here and have got the fur direction right. As you are asking for advice, the thing that immediately comes to mind is that it needs more tonal contrast. In the photo, the dark bits are black, in your drawing the darkest part is grey. I would especially darken up the shadow area round the bottom and (our) right of the nose.
A well balanced drawing or painting will contain tonal values from very light to very dark. To test the tonal values I find it helps to print out a black and white copy of the original photo and the drawing/painting. Then you can see immediately which areas are dark, middle and light in tone, and where you need to adjust values.
I hope this helps.
Spicey x (Also doing Pet Portraits.

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