"A webnovel"...you could at least tell the genre and give a short summary
what the story is about 
Here is some advice which is meant to make it easier for you to find an artist.
Prepare following things:
-summary of the story / define the genre
-turn your webnovel into a comic book script
-make character sheets for every character
(you can do this without being able to draw,
some people use character creation apps, you
can also use games which include a chacter creator
to make turnarounds)
-collect or create all reference that the artist can use. Backgrounds,
3d models, rooms etc
-turn your comic book script into thumbnails with explainations
for the artists. The thumbnails don´t have to be drawn, they can
only include text or they can be screenshots from movie scenes,
reference pictures etc.
