Hmm those look fine to me! Nice work! The branches are always a really bright white or yellowish colour at the beginning of a jin and after a while they fade and look natural. The aim of the lime sulfur is to preserve the wood from rotting, some people just burn the wood with a blow torch and it seals it like that. There are many methods but your tree looks good. You dont need to dilute your solution, just apply it very sparingly as i said earlier on in this thread. Happy Bonsaing