This is the only way to maintain the original size. Save a Bitmoji as a photo. Slightly recrop that photo then send it from your photo gallery. It is extremely annoying to have to do it this way, and rather any efficient, but it is the only way to maintain the original size of a Bitmoji. Those tiny Bitmoji‘s in my text string just don’t do the trick.
Now I’ve run into a new Bitmoji problem on my iPhone. My Bitmoji friends never update. My girlfriend and I constantly use our Bitmojiselves in the same Bitmoji scene. But she still has on the same outfit that she put on six months ago. She updates her outfit every two or three weeks. But it does not come through to my Bitmoji app. All of my Bitmoji friends have on the same outfits they had on six or seven months ago. No matter what I do they will not update. I can turn the friendship off and leave it off for days and then turn it back on and they still have on the old outfits.