To convert a basic 2D photo of a tree into a realistic photo using CORELDRAW X8, follow these steps: 1. Open CORELDRAW X8 and import your 2D photo of the tree. 2. Use the 'Effects' menu to apply photo effects that enhance realism, such as 'Gaussian Blur' for softening edges or 'Sharpen' to enhance details. 3. Adjust the color balance and contrast using the 'Adjust' menu to make the colors more vibrant and realistic. 4. Use the 'Transparency' tool to blend layers if you are adding additional elements to the photo. 5. Apply textures using the 'Texture Fill' tool to give the tree bark and leaves a more realistic appearance. 6. Use the 'Drop Shadow' tool to add depth and dimension to the tree. 7. Save your work and export the final image in your desired format.