Tower theme uses the default image sizes of wordpress, such as listed here:
// Thumbnail (default 150px x 150px max)
// Medium resolution (default 300px x 300px max)
// Large resolution (default 640px x 640px max)
// Original image resolution (unmodified)
The only images modified are listed in function codeless_images_sizes(). You can edit them to your wish. For more detailed information, please read this article.
