Good
For you first attempt in drawing a person, I have to admit it is astonishing. But as you wrote, I would be happy to give you some advice about this:
The upper curve you made in the nose looks a little bit odd. just make the line straight, this will look better.
The right line of the face is too straight, then. The line should come forward at the forehead to the brows, then at the eyes make a small curve in the inward direction, then a curve in the outward direction, to draw the cheekbone. Then make the line again straight until you reach the chin.
The shading is good and you definitely have great talent.
For the tiger - I LOVE IT! KEEP IT UP!