Final answer:
Lila should next apply animations to her 3D characters in PlayCanvas to bring them to life within the scene, after finalizing their textures and details.
Step-by-step explanation:
After Lila has added textures to her 3D characters and finalized the details in PlayCanvas, the next logical step would be to apply animations to the characters. Animating the characters will bring them to life and allow them to perform actions within the scene. The use of the eyedropper tool, importing additional textures, or using a sprite editor would not be suitable next steps after the texturing and detailing phase has been completed and would not contribute to the progression of character development at this stage.