[question...] what picture should i use??

[the angel song]

LOL @ scary pic!

I think any one of those album covers mentioned would work. Actually, I have to enter an art contest as well and my backburner option is ayu, so my advice is to pick a picture not because it is easiest, but because you *really* like it. Then from there, don't focus on all the details (that's suicide) just work on laying out proportions. From there, after you build ayumi and you have her sketch to your perfection, then add detail to her, add background, color, etc. This is the only way to tackle those potentially gorgeous pictures like "BLUE BIRD"'s cover!