As for the 2nd reason, when westerners attempt to imitate our Manga style they unconsciously just end up using their own comic style. All the pictures you see below are westerners attempts at imitating our Manga style from our already existing Anime named Sailor Moon :
The pictures you see is just a few of the many examples of westerners attempts at imitating our Manga style, but as you can see even when using existing images as the base they are still fail and just end up using their own comic style instead. There are many more examples like that which you can see on the internet by simply using the keyword "Sailor Moon redraw" or similar keyword. From the many results you see, you will tend to see the westerners who attempts to make a replica from our already existing Anime images are end up making the characters replica to look like their own cartoon/western characters while us Asians tend to end up making the characters replica look to like our original Anime/Asian characters.
This fact proves and shows that :
1. When peoples are drawing something then they will unconsciously draw something based on what they mostly see every day. In other words each races fundamentally have different inspirational base which includes to affect each races art styles and base, this fact is the main reason why our Manga style are different from the westerners comic style. This fact also explain why the westerners who Cosplay our Anime/Asian characters tend to make the accessories for the Cosplay to be either too big or too small while us Asians tend to make the accessories to fit.
2. We Asians make our Anime/Asian characters based on us Asians while westerners make their cartoon/western characters based on themselves. We Asians make our Anime/Asian characters based on our Asians big narrow set eyes, small nose, round face, sharp jaw and smallish body form while westerners make their cartoon/western characters based on their small deep set eyes, big long nose, square face, square jaw and big wide body form.
3. The westerners who keep claiming our Anime/Asian characters of copying their cartoon/western characters to be just a bunch of retarded losers, retarded not only because our Anime/Asian characters totally look different from their cartoon/western characters but also because those westerners themselves can't even make 1 Anime to this day, losers because those westerners realize that our Manga style are superior compared to their comic style so they try to associate their inferior comic style to our superior Manga style.
In case there is any of you who don't know, the style you see in our Anime is called as Manga style because the style is the same as what you see in our Manga which exist first long before our Anime, as for our Anime is just the animated version of our Manga.