Diamond Square Algorithm

Hello,

So I've been making a random terrain generator however the terrain it is producing is not excellent. I would like it to appear more random and realistic. Here is my code and a screenshot of what I'm getting.

 #pragma strict
     var width : int;
     var height : int;
     var desiredHeight : float;
     var step: int;
     var minNoise : float;
     var maxNoise : float;
 function Start () {
     var terrainDat = GetComponent(Terrain).terrainData;
     width = terrainDat.heightmapWidth;
     height = terrainDat.heightmapHeight;
     var xAnchor : int = 0;
     var yAnchor : int = 0;
     var heights = terrainDat.GetHeights(0,0,width,height);
 
     width = width-1;
     height = height-1;
     step = width;
     //corners
     heights[xAnchor,yAnchor] = desiredHeight;
     terrainDat.SetHeights(0,0,heights);
     heights[xAnchor,height] = desiredHeight;
     terrainDat.SetHeights(0,0,heights);
     heights[width,yAnchor] = desiredHeight;
     terrainDat.SetHeights(0,0,heights);
     heights[width,height] = desiredHeight;
     terrainDat.SetHeights(0,0,heights);
     
     for(var p = 0; p<=1400; p++){
     //print(width);
         //diamond
     heights[xAnchor+width/2,yAnchor+height/2] = (((terrainDat.GetHeight(xAnchor,yAnchor)+terrainDat.GetHeight(width,yAnchor)+terrainDat.GetHeight(xAnchor,height)+terrainDat.GetHeight(width,height))/4.0)-this.gameObject.transform.position.x)/(terrainDat.size.x*10)+ Random.Range(minNoise,maxNoise);
     terrainDat.SetHeights(0,0,heights);
         //square
     heights[xAnchor+width/2,yAnchor] = (((terrainDat.GetHeight(xAnchor,yAnchor)+terrainDat.GetHeight(width,yAnchor))/2.0)-this.gameObject.transform.position.x)/(terrainDat.size.x*10)+ Random.Range(minNoise,maxNoise);
     terrainDat.SetHeights(0,0,heights);
     heights[xAnchor,yAnchor+height/2] = (((terrainDat.GetHeight(xAnchor,yAnchor)+terrainDat.GetHeight(xAnchor,height))/2.0)-this.gameObject.transform.position.x)/(terrainDat.size.x*10)+ Random.Range(minNoise,maxNoise);
     terrainDat.SetHeights(0,0,heights);
     heights[xAnchor+width/2,height] = (((terrainDat.GetHeight(width,height)+terrainDat.GetHeight(width,yAnchor))/2.0)-this.gameObject.transform.position.x)/(terrainDat.size.x*10)+ Random.Range(minNoise,maxNoise);
     terrainDat.SetHeights(0,0,heights);
     heights[width,yAnchor+height/2] = (((terrainDat.GetHeight(width,height)+terrainDat.GetHeight(xAnchor,height))/2.0)-this.gameObject.transform.position.x)/(terrainDat.size.x*10)+ Random.Range(minNoise,maxNoise);
     terrainDat.SetHeights(0,0,heights);
         //check next
     if(xAnchor+width >= 64 && yAnchor+height >=64){
         //print("y");
         width = width/2;
         height = height/2;
         step = width;
         xAnchor=0;
         yAnchor=0;
     }
     else{
         //print("n");
         
         if(xAnchor+width >=64){
             yAnchor = yAnchor + height;
             xAnchor = 0;
         }
         else{xAnchor = xAnchor + width;}
     }
     }
 }