I love that triangle dish. I may have to see where I can buy some of those. Anyways, read this. If you're allowed, some of these techniques may enhance a dish. http://www.pixiq.com/article/food-photo-tricks
Notice though that in the video, you don't see any shadows and everything is evenly lit. You can add all the chemicals and place every little thing by hand on a plate but in the end, lighting is what will make it look good or bad. Food isn't black and white. If you notice in that video, every color has a shine to it. You want to bring out the colors in your dish and most of those ''cheats'' are for making certain colors stand out. You want it to be well balanced and well proportioned. Not too much, but not too little. At the end of the day, it is still food. Food is what we eat so it has to look appetizing.
Another key factor is culture. Food comes from all over the world. If you do an Italian dish, make sure you evenly space all of those fresh ingredients like parsley, tomato, garlic, pasta, etc. You want to look at a picture and know what it is you're looking at. If you're clueless about the dish, you want to be able to see some fresh ingredients incorporated that will give you a sense of where you may find a dish like that.