I've never figured out how to post a photo here. So here's a link. The specimen in the photo is the largest Anthurium cubense I've ever personally seen. It is close to 8 feet tall and was on display at the 2007 IAS show in Miami. The plant was grown by Bill and Denis Rotolante at Silver Krome Gardens in Homestead, FL.

Here is a link that might be useful: Anthurium cubense

I have an A. cubense that looks a bit different from yours, Bihai. Mine seems to look more like A. plowmanii but with much larger and wider leaves.

Here it is:

Mine is still very young. I'd estimate without going out to measure them that the leaves are maybe 18-24" long. I think it will look more like yours when it gets more size