An example of the graphics quality in tv series
Hiccup and
Astrid remain friends in the series
The series has all of the kids from the movie as well as their dragons
Hiccup in RoB. Note the slightly less emotional, more bland CGI rendering.
Hiccup in DoB. Note the emotionally stronger, more movie-like, CGI rendering
If you look closely, you'll notice Hiccup's face and body, minus his boot and vest, are actually from the movie. The vest and boot are components of the series.