Your plant looks nice.
Grammatophyllums are large to enormous, warm-growing plants. People have bred them with cooler-growing Cymbidiums in an attempt to produce plants like Cymbidiums that will flower in warmer areas. From what I have read they are closer in size to the Cymbidium parents, which is nice.
I have a smaller plant of Grammatocymbidium Lovely Melody 'Lipstick' than yours. It is also growing vigorously. I saw a number of sites with people saying it grows to about a foot tall (32cm), but other photos I found show it getting about 3 feet tall (90cm.) My guess would be it gets bigger if given a large pot. You can see a photo in this forum here:
Sunday morning blooms
If you search the Internet on the name you will find lots of photos of this plant.
The proper way to write the name is Grammatocymbidium Lovely Melody 'Lipstick' . The cross Grammatophyllum citrinum x Cymbidium ensifolium is known as Grammatocymbidium Lovely Melody. One clone was selected out and given the clonal name 'Lipstick' . This clone has a red lip. I also saw photos of other clones which are all green-yellow.