+ to all (i.e., non standard first self-portrait, overall idea good, some technical issues including focus, in particular such hairs should be better exploited by more DoF, I would let it horizontal, lastly cute subject too).
As a very first attempt without working much, I would simply try again in more or less the same setup with some home-made diffuser on the built-in flash (like a tissue paper drop on flash).
By the way, I have a Rebel XS too. Perhaps you know that you can hook up it at the computer and see LiveView on computer screen: this may help in self portrait.