Update README.md

README.md

@@ -71,8 +71,8 @@ If you use this dataset in your research, please cite the original paper:
 Below is an example of one benchmark instance (`Terrain53`) under the sparse threat scenario.
 
 <p align="center">
-  <img src="<URL_TO_3D_IMAGE>" alt="Terrain53 3D View" width="45%" style="display: inline-block; margin-right: 10px;">
-  <img src="<URL_TO_2D_IMAGE>" alt="Terrain53 2D Projection" width="45%" style="display: inline-block;">
+  <img src="img/terrain53.png" alt="Terrain53 3D View" width="45%" style="display: inline-block; margin-right: 10px;">
+  <img src="img/terrain53_view.png" alt="Terrain53 2D Projection" width="45%" style="display: inline-block;">
 </p>
 
 - **Left:** 3D terrain surface with elevation and cylindrical threats (obstacles).