Sumatran Tiger drawing update

After finishing my commissioned drawing of Tess and Buster i have now re-started work on my Sumatran Tiger drawing that i put to one side at the end of last month.I havn't progressed it much so far other than to finish both fore limbs and alter the background toning a little.ive made a start on the cats ears,which is always my least favourite part of a big cat drawing,because the hairs are so complex and detail difficult to suggest easily.one ear is complete and the second has some tones layed in with much more to do,but once that is complete i can start to plot in the tigers stripes and begin to bring the animal to life