Right, I'm back. I did read two of your pieces. I haven't read the canon on which they're based (I only got as far as HP1) but the first one about Goyle(?) and his mania for punctuation was witty and amusing. You do good dialogue, the one thing I would say is avoid having all your characters sound too similar when they speak. The second was about Nymphadora (Jesus what a name) Tonks and her uncle Lucius and that was well described though I thought given the nature of the relationship I thought it would have been shaded a bit darker. But that might be personal preference.

I've only written one piece of fanfic and I rarely read it so might not be the intended audience but I hope this is useful FWIW.