Not bad, but on a constructive criticism note, the structure looks too canine. Big cats have a much more sloping muzzle, as well as smaller ears in comparison to the rest of the head. The chest also generally looks much less defined in felines than it dose in canines.
Hope that helps! ^^
I have the very bad habit of giving every animal I draw canine-like anatomy xD I'm hoping with practice this habit will go out the window :3
And you're most certainly welcome! Glad to be able to help. ^^