quick question, if I'd like to maintain a look of photo I trained I'm getting good results, for exam

quick question, if I'd like to maintain a look of photo I trained I'm getting good results, for example it's a certain type of "ohwx City", should I train another model on top of a previous checkpoint or should I return to stable diffusion 1.5? For example if I'd like to train a certain type of "elos Bus" to show up in the photos of the "ohwx City" should I continue from the ohwx city checkpoint or train it on the s.d. 1.5 checkpoint?
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