Improve README with sample image and refined header structure

Added a sample image grid to the README.md to showcase Abominable Workflows outputs.
The introductory text and table of contents have also been refined for clarity.

README.md

@@ -8,12 +8,13 @@ tags:
 - text-to-image
 - PixArt-Σ
 ---
-# Abominable Workflows
-**A collection of comfyui workflows for PixArt-Sigma, each designed to bring a unique visual style to life.**
 
-**Abominable Workflows** is a versatile suite that combines the creativity and
-prompt adherence of PixArt-Sigma with the impactful visual detail of the SD15
-models that we've always loved.
+![Abominable Workflows Grid](./abominable_grid.jpg)
+
+**Abominable Workflows** unleashes the full potential of PixArt-Sigma, enhancing its exceptional prompt following capabilities with the rich detail of SD15 models to generate stunning, unique visuals.
+
+
+## Setup Guide
 
 \> [Required Files](#required-files) <br/>
 \> [Required Nodes](#required-nodes) <br/>