Hello! If you mean in terms of actual money I would say $0 😅 This is because I did not sell the adopt for real currency and they have not accumulate any commissioned or higher quality pieces. 

If you mean in the terms of art worth, I would say a flatcolor fullbody of similar quality or something of similar worth to that like a shaded or flatcolor halfbody etc. Really though, with art worth it's up to you depending on how much the character means to you :)