Here are some sketches for the practice I did before my pattern. 

This the scan of the branch rough layout which then I traced again in illustrator.

Here is the scan of the acanthus leaves which I draw separately and placed on the branches.

Same way i traced the flower and after placing on the branches layout I drew the background motifs freehand directly in illustrator in the negative spaces.

Here is my final pattern.

 

The Mockup of the pattern as wallpaper.