Versatile Shapeshifter

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Well, I don't take any commissions currently, but I think I may open a shop next month in order to get a few sealed letters every month since I can donate myself. But I haven't much time, this is my main problem (studies xd ). So I wondered if I asked sealed letters for (detailed) headshots, is it too much or will there be people who this may interested ? Or what do you think I should ask my drawings (headshot/waist up/full body/etc ~ without or with a background and so on) ? Don't hesitate to give me your opinion 3nodding Thanks in advance ^^

Some art samples :

Headshot
Fanart of Rikku (SD/Chibi) *this one is quite old btw, I think the face would be different I draw chibi now*
Fanart of Yuna
My OC : Black and white version // Colored version
Latest Gaian Commission (for Midorinita) - Full body character + background