Well for a starting point this is freaking good. When I debuted on open source AI that was a brutal deception. In pony the most important thing is your score, in positive score_9, score_8_up, score_7_up and your neg will be score_6, score_5, score_4, just keeping this can help to improve the quality of your generation, don't hesitate to experiment different ways of prompting to see what can give you the most successful generation, for example: 1girl, long hair, (wavy hair:1), brown hair, blue eyes, (almond eyes:0.7), (big breast:0.8) etc... Here I add some valor to help the "AI" to make what I write, that can help to make persistent character without Lora training but even with it we can't forget the rng of generation. In hope that can help you to improve the quality of your work. Good luck !