I just felt like making Ulti! Outside of one lone, edited image, all images from this dataset have her with her mask, as she otherwise always wears it.
While it will be extremely hit-or-miss and you'll likely have to play with it, I can confirm maskless images can be done; I recommend adding (no mask, nothing covering face) to your prompt. Play around with weights, and good luck!
Obligatory self-promotion: consider supporting or commissioning me at https://www.patreon.com/MetalChromeX or http://www.fiverr.com/s/VY34o4m so I can afford an Nvidia 5090 when I can buy one priced at or near the MSRP (screw you, scalpers!)!