Thanks everybody to your suggestion, but I'm rather sure to get the cloud (or the clouds) under Goofy and the balloon above him. In my opinion they match very well. Maybe in the future I'll do a colored feather near to Goofy, such as this:
https://www.google.it/search?q=piuma+cartoon+tattoo&espv=2&biw=1366&bih=667&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiwlP6bg4TNAhXIyRQKHenNCSQQ_AUIBigB#tbm=isch&q=feather+tattoo+man&imgrc=QHW0a7GzGDxckM%3A
(it's the first feather I've found on google, I don't like it )