It depends on the model and any kind of special effects you're going for. The best thing you can do is send us a message with your preferred model size and reference images, and we can send a quote.
For a typical commissioned paint job, you can expect one-inch-based models to be a flat $50, 2"-base models to be between $50-$70, 3"-based models to be around $100-$150, and 4"-based models such as large dragons to be $200-$250. Models which consume high amounts of resin may also impact the final cost.
If you're looking for a basic "tabletop-standard" paint-job that looks good at a distance, please specify that upfront and we may provide a discount, as by default we try to paint to a standard that still looks great under close inspection.