The first depiction of elves were more akin to faeries in myths and folklore. A blending of Germanic mythology and English folklore with Celtic folklore is what inspired JRR Tolkien the <modern> elf look (giving them a more humanoid look) we all know today and from which was adapted by writers, games etc...Slender, tall and beautiful.
Yes this is true. I have no argument against this. While earlier adaption of Elves was made Tolkien kind of made Elves very popular first with books and then with movies based on his books. Now they are even making a TV series based on Tolkien world, but I can not know if that series will be even good and in worst case that TV series will be a disappointment.