"Passion for sugar arts" is not normally used inside a bakery. The skills that matter to a bakery are timing, multitasking, and people management. They can teach you to decorate a lot faster than they can teach those other skills.
How to get your foot in the door: do your homework. Make a table of bakeries, their style of decorating, their contact info, look carefully at their website. Look for the ones that are busiest or that take interns (many now do say that in their careers section).
Then call the bakeries on your shortlist and ask for the manager's name and best time to contact them. Use google to see if there are any useful email addresses on their website.
Write a cover letter for your resume addressed to this owner or manager, that stresses your professional attitude and your willingness to work with customers. Ask for an informational interview and a tour. Follow up with a phone call to schedule a time.
Put together your portfolio and take it with you to this informational interview. Let it speak for itself. At the tour, look carefully at the way that they have set up work areas. Look at the condition of their equipment. Look at the stacks of their supplies and the cleanliness of their shipping area. Look for obvious insect infestations.
Follow up with a thank-you letter as you would after any interview. Keep in touch with the bakeries that you found to be most appealing after you saw the back rooms.