- Be alone. Or with another girl. 
- Show your face. All the time. Especially when you cum.
- If you wear glasses, wear your glasses. Glasses are sexy.
- Get your tits out. One will do. One tit can be surprisingly sexy, actually.
- Try using a dildo instead of a vibrator. Less distracting sound.
- No music. I want to hear you, not music.
- Make a lot of noise. Enjoy yourself.
- Have a play before you start. Nothing sexier than a turned on woman. Also, it makes you cum faster.
- Cum. At least twice. It's a porn video, I want to see you enjoy sex.
- Do you like anal? Good. Do anal. If not, try it. First time anal vids are fun.
- If you're doing anal, use a dildo not a buttplug. I want to see you fuck your arse.
- If you're doing girl/girl, eat pussy. Go hard. Go fast. Throw each other around a little. I want to see passion. I also want to see rimming, but that's just me.
- If you're using a vibrator, don't use a lovense [visible part is too small] or a Hitachi [too loud].
- Talk. Doesn't have to be dirty. A little "Oh yes" or "Oh God" or a "FUCK!" every now and then is enough.
- If you're watching a video, put a link in the comments so we can watch it along with you. That's hot.
- If you're using a cameraman instead of a tripod, shut him up. Nothing less sexy than a talkative cameraman.
- Be free. I don't have any money.
- Try reading porn while you play with yourself. Keep reading while you're cumming.
That's it. It's not about what you look like, it's about what you're doing. I want to see you enjoy yourself more than anything.