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Trained on 16 photos
1600 steps
1 epoch
For txt2img, a weight of 0.7-0.9 will give a little more flexibility, but 1.0 isn't bad. A weight of 1.0 works really well for inpainting. Face restoration isn't usually necessary, but I recommend setting your face restoration strength inside auto1111 settings to something like 0.7-0.8.
The checkpoint you use can heavily influence the likeness of a celebrity Lora. I train my Lora's on SD15, so you'll get the best likeness on any model that used SD15 as the base model. See this example for how a checkpoint can influence the look of a Lora.