update pngs

Signed-off-by: hsliu <liuhongsheng4@huawei.com>

Author: hsliuustc0106

_posts/2025-11-30-vllm-omni.md

@@ -50,8 +50,16 @@ vLLM-Omni is not just a wrapper; it is a re-imagining of how vLLM handles data f
 
 * **Performance:** We utilize pipelined stage execution to overlap computation for high throughput performance, ensuring that while one stage is processing, others aren't idle. 
 
+<p align="center">  
+<img src="/assets/figures/2025-11-30-vllm-omni/vllm-omni-pipeline-async-stage.png" alt="vllm-omni pipelined stage execution" width="80%">  
+</p>
+
 We benchmarked vLLM-Omni against Hugging Face Transformers to demonstrate the efficiency gains in omni-modal serving.
 
+<p align="center">  
+<img src="/assets/figures/2025-11-30-vllm-omni/vllm-omni-vs-hf.png" alt="vLLM-Omni against Hugging Face Transformers" width="80%">  
+</p>
+
 
 ## **Future Roadmap**