Japan Illustrators' Association hold the contest of illustration every year. This is the international illustration competition. Anyone, professional or amateur, can apply.
This competition is for finding newcomers.
People in advertising and publishing are paying close attention to this.
Application essential points of this competition
The genre of the works : You can apply for works of any genre, including hand-painting works, digital works, and three-dimensional works. Condition of the works which you can apply : They must be original works which have not used for jobs.
The images you show on your web site are OK.