Omega is very difficult to capture. His core is very bright with many stars very near. I liked your photo. At sky and periphery you did well the colors. The core is very bright and don't show the colors.
There are some old red-yellow stars together with new blue-white stars inside it.
For luck I had a good seeing and I managed to do it. You need to reduce the sensitivity to avoid saturations :
http://astronomia-e-astrofotos.10697...013-td903.html