Searching information about this cluster I found that it is located at the other side of Milk Way, with much gas cloud and dust between us an him. And in the halo of Galaxy.
Therefore it is not an easy target to capture.
I didn't find images with colors of stars: the most (or all) are b/w.
The image with Canon 350D (mod) is better than with Canon T3.
I am glad to get catch him as I did.