How do I get this coloring?

[g_ivy_ar]

Hi everybody! I'd like to achieve the same kind of coloring from these beautiful icons by eledhwen_girl. I've tried different things but so far the results weren't even close. I know she uses gradients and many color overlays, can somebody give me ideas please? I'll really appreciate it :D
(Sorry for posting this here but I don't know where else I can ask.)