{ Hello! I was just wondering, since approval is important, if it was alright if your art was used in Icons? I don't want to use them without consent, of course, and if you say no, that's fine! I just wanted to make sure!}

Hi, it’s very sweet of you to ask :3
To answer your question, yes, feel free to use the images for small icons. As for the larger images, they are fine to be used as you may as long as the signature stamp (with my tumblr address) is intact. :]