Failing grade 11 computer science isn't the end of the world. Yes you will need to make up the credit, but it won't impact your chances for admission to post-secondary programs so you can relax on that score. Having said that, I would still try to get the most out of the course that you can.
If you are an international student attending high school here in Canada, presumably your school has guidance counsellors. I would definitely reach out to them. If you are currently taking art course through your school I would also speak to your art teacher(s) to see what programs they would recommend you to apply to and what will be required (most likely a portfolio). For further research the following websites will give you more information on programs available and their entry requirements.