How do I increase the resolution or quality of a generated image?

Raise the resolution setting before you generate: most image models on PicX Studio render at 1K, 2K or 4K. Nano Banana 2 costs 35 credits at 1K, 53 at 2K and 105 at 4K; Nano Banana Pro costs 53 credits at 2K and 105 at 4K and gives the most detail. Add quality-signaling keywords to your prompt: '4K, ultra-detailed, sharp focus, high resolution, professional photography.' For an image you already have, the free Image Upscaler enlarges it for print-ready output or large displays.