Draw preview texture2d image in unity

void OnDrawGizmos() {

	GameObject t = GameObject.Find("Preview" + gameObject.GetInstanceID());
	if (t == null) {
		GameObject go = new GameObject();
		go.name = "Preview" + gameObject.GetInstanceID();
		go.transform.position = transform.position;
		go.transform.localPosition = transform.position;
		go.hideFlags = HideFlags.DontSaveInBuild | HideFlags.DontSaveInEditor | HideFlags.HideInHierarchy;
		SpriteRenderer renderer = go.AddComponent<SpriteRenderer>();
		Texture2D tex = new Texture2D(2, 2, TextureFormat.PVRTC_RGBA4, false);
		tex.LoadImage(imageAsset.bytes);
		Sprite sprite = Sprite.Create(tex, new Rect(0, 0, tex.width, tex.height), new Vector2(0.5f, 0.5f), pixelsPerUnit);
		go.GetComponent<SpriteRenderer>().sprite = sprite;
	}
	else {
		t.transform.position = gameObject.transform.position;
		t.transform.localScale = gameObject.transform.localScale;
		t.transform.rotation = gameObject.transform.localRotation;
	}
	
}