Just add the class "img-responsive" on the image tag to make it "responsive", the width and height of the image will automatically adjust to fit the screen on other devices, even on tabs, or on any of today's high-end mobile phones.
Removing the "hidden" class will do the trick.
The default "img-responsive" class horizontal alignment of bootstrap 3 is left aligned. If you would like to center an image on your layout with that class, specially for your mobile users, just add the "center-block" class along with "img-responsive" class, and it will be nicely centered horizontally.
One of the best ways to express one`s feeling is writting. Here are 20 Christmas Text Tutorials that you can use in expressing your feelings for the Yuletide Season. Surely your love one`s will be glad to have your share of Christmas spirit. Have a fun filled Christmas, and enjoy these Photoshop and Illustrator Tutorials.