I tried to draw grown-up Taiki.. I drew it from memory, so there can be something wrong about these two /:
I really like how Takasato Kaname looks in that picture, especially with Gouran. But remember that as a teen Kaname had a interest in art so I wouldn't be surprised if Kaname has two outfits in the Gyosou arc, the normal outfit he wears in the picture you drew, and a much plainer, simpler style of robe usually used while he is in his studio.
Taiki looks very nice here! I love the way you colored everything. <3 Very pretty color scheme.
Guh I miss this anime. Taiki looks rather beautiful and mature here~ Love your sharp lines but gentle watercolor.
Wishes he will have long hair again...