I would personally go with [name_f]Tuva[/name_f] [name_f]Jayne[/name_f] or at least something classic (like [name_f]Pearl[/name_f] you mentioned) to balance Tuva’s uniqueness. For nature, [name_f]Tuva[/name_f] [name_f]Violet[/name_f] (Violet [name_f]Ione[/name_f] would be a unique alternative to this name) comes to mind first.
[name_f][/name_f]Other Nature-esque suggestions:
[name_f][/name_f][name_f]Tuva[/name_f] [name_f]Rose[/name_f]
[name_f][/name_f][name_f]Tuva[/name_f] [name_f]Mae[/name_f]
[name_f][/name_f][name_f]Tuva[/name_f] [name_f]Sage[/name_f]
[name_f][/name_f][name_f]Tuva[/name_f] [name_f]Coral[/name_f]
[name_f][/name_f][name_f]Tuva[/name_f] [name_f]Willow[/name_f]
[name_f][/name_f][name_f]Tuva[/name_f] [name_f]Maren[/name_f]
[name_f][/name_f][name_f]Tuva[/name_f] [name_f]Opal[/name_f]
[name_f][/name_f][name_f]Tuva[/name_f] [name_f]Fern[/name_f]
[name_f][/name_f][name_f]Tuva[/name_f] [name_f]Summer[/name_f]
[name_f][/name_f][name_f]Tuva[/name_f] [name_m]Robin[/name_m]
[name_f][/name_f][name_f]Tuva[/name_f] [name_f]Meadow[/name_f]
[name_f][/name_f][name_f]Tuva[/name_f] [name_f]Rosalind[/name_f]
[name_f][/name_f][name_f]Tuva[/name_f] [name_f]Skye[/name_f]