About bug eyes- not sure if this applies every time, but my Lesser Butter's bug eyes have disappeared as he grew older. They were the most prominent as a hatchling and were still a bit noticeable maybe until 6 months old. Now that he's really full grown, they're all but gone.
Here he is as a hatchling:
And here he is now at ~13 months old. Unfortunately just an iphone photo, but you can see they're pretty normal looking. Or at least, if they're still not normal, I can't tell. He's also kind of pink, because he's going into shed.
Don't know if it would affect your decision, but that's how mine developed. I'm breeding for super butters/super lessers next spring.
Super russos/white diamonds commonly develop yellow tints and have a yellow dorsal stripe. I've heard super lessers/butters are technically the whitest- just the bug eye issue. Mine definitely is still white with no yellow. Some of the white diamond examples on WOBP have been edited so that there is less saturation on the snake's body. Lies LOL.