As portraits go, it's not anything special. Try this:
Frame in portrait (unless there is a reason to frame on landscape).
Frame looser.
Move the light around so the light isn't so flat.
Do something with your expression.
I never really tried to frame portrait, but I will see what I can do with that. I agree that it could probably be better not so close and as for the facial expression..yes it is pretty expressionless.
I take it you don't have a tripod yet. In that case, shoot horizontally (with the camera resting on the windowsill) but frame
way big, and crop off the sides later. Don't worry, you'll still get a picture, even if your face looks way too tiny when you first look at it.
If you are close to the window, put in a little bit of "less exposure", but if you are far away, put in just a touch of "more exposure" using the exposure compensation feature. Try a bunch of shots in every way that you can think of, and then keep only the best one. Throw the rest in the trash. :idea: