Language family tree continuation

(you have several choices that would be "correct" for the description of how the languages split into subgroups- this is just one idea that might make it easier for your reader).

Mandarin is perfect to approach  the diversity of Chinese languages. Even if Vietnamese, Japanese and Korean... aren't Sino-tibetan languages, they have adopted, and then, some of them have since abandonned, the ideographic writting system that originated from China. plus, Mandarin is alsoit's a tonal tongue; it's like to singing.

("approach" might not be the best word choice- not sure of the intended meaning there- perhaps "Of all the Chinese languages, Mandarin is the perfect language to study first...")

Arabic is the key for the whole Afro-asiatic world, ( even if each region has its local dialect). contrarily Contrary to Indo-european and Chinese languages, Arabic is really consonantic. I like the fact that these languages are related to the civilizations that have created writing systems, such as the Egyptians who were also speaking a semitic language.

(Austronesian) Malayo-polynesian group is fascinating. Most of the family groups have a continuum that spread on the ground. This group seems to spread through the ocean. Speakers are settled on islands, from Madagascar to Hawaii, crossing Oceania’s Islands. As Indonesia is in the middle, let’s say Bahasa Indonesia and Malay are the entrance doors of these « sea-languages ».

Then, Ouralo-altaic is a debated group. It could include Turkish, Monghol, Tunghuns, Mandchu... ( some people even include Japanese and Korean, but it seems to be a rejected theory. No matter it’s a non official group, I depict Ouralo-altaic languages with the images of vast plains and steppes crossed by knights on horses. Yep, I assume Attila and Ghengis Khan were speaking ouralo-altaic languages. And yep, Dothraki's Idiom seems to be partly inspired by that :p