The missing shadows and light are the problem. Without them, Tiger is completely flat. The shadow under his chest and rear leg do at least fix him to the table, but you need the rest too.I tried to avoid the missing shadows and light.
Talking about "fixing"... you need to apply the lighting direction to the objects on the table too. They're currently floating in space.
According to the shadow under Tiger's tummy, the light is some distance away from the top of the drawing. It could be central, but you'll find it more useful if you move it off to one side - let's say to the left. Now study each part of Tiger and ask yourself a simple question:
Can this area under my pencil see the light, partial light, or no light at all.
Then ask yourself if that part of Tiger might cast a shadow on the table. You don't need to be terribly accurate with shadows, but they do need to exist.
Of course, Tiger is white, so you might think there aren't any shadows. But THERE ARE. They're just pale, because white hair reflects light within itself, which dilutes the intensity of any shadows.
I've added a few shadows. Not correct shadows, but where I'd expect to see shadows. The objects in the top-left corner show us the light is shining from above and to the left. I've used the same angle for Tiger.
Tiger is coming along very well, but he does need some modelling to plump him up.