Can you critique my portfolio?

http://www.pond5.com/video-sound-effects-music-after-effects-photos-illustrations-3d-models/1/artist:mrs_veronik.html

I start upload from January and I have no sales. I doing something wrong? My footage isn't nice enough? I have wrong keywords? My prices too hi?
I'd be very happy to hear some suggestions!

Hi,
I looked at your portfolio and love the vibrant colors of the wheat fields. All of them are really well done.

My only critique is you need to have patience. You have 79 clips in a sea (pond) of over 1.5 million.

Also, look at your subjects and search for others like it. Are there a lot in the subject? Take for instance your desert shots.
I searched for "africa, desert" and found over 1900 clips.
I mentioned 1.5 million clips but people don't actually have to go through that many to see yours but if there are 2000 of the same subject as in the case of the desert clips where are yours as far as interest. You have to think like the buyer and ask yourself, "why would they buy mine instead of all of those others"

All I'm saying is diversify your portfolio. Sometimes when I think of something I want to shoot I search for that subject. If there is already a ton of videos I'll either scrap that idea or think "how can I shoot it better"

Keep up the good work,
Jake

Thank you for your opinion. I'll continue to work!