Found some time and sat down with these files. As others say, I'm going to agree with them as well. HOTD and Koi wa Sensou. But, I'm going to throw a curve ball. I love your Scissorhands cover.
Scissorhands 1) Your vocal range and voice type fits this perfectly. The pace that you are singing at is closely tuned. I'm not a music expert but I love your voice in this. While I was listening to this, you reminded me of Shiina Ringo.
2) This is going to speak for both Hatsune Miku cover you posted. Hatsune Miku concert + Hatsune Miku being such a big idol, both will be a hit! Unless, by ratings, Scissorhands isn't that great among of Mikus' other works.
3)I'd give this an 8.5/10 in difficulty. The pace itself and the change in pace is what makes it difficult.
4) At the beginning, after the "aishite" sequence, the song's pace starts to rise and then you have that instrumental piece. In my opinion, at that part you kinda calm down a bit and let the instrumental run its course. But when this part starts, http://youtu.be/8I80Mv7ypRE?t=30s, theres that small window of downtime and the pace picks up again. I'm thinking you can start some movement there. I apologize if I sound retarded. I also apologize if I got you confused. I'm not that great at explaning things. Aside from that instrumental, there is, I believe, one more instrumental section.
If you do end up performing this song, you should give a shoutout to me and Looking4moar! :D
I don't know the details but how many songs are they letting you perform during the audition and how many rounds will there be before finals?
Just one song for both the auditions and finals. I do love Scissorhands so much (and so does teh bf), but Koi wa Sensou is the more popular Miku song, and it's way easier for me to sing.