I looked it up, and Mars was only about 12.6" at the time of your image - this is a great image for such a distant Mars! Conditions might be far more challenging this year, but on that rare perfect day, the much larger apparent size of Mars should give us a good chance of capturing a nice image.
I went into my photobucket album and found the original image, it was dated April 16th. Looking it up on Stellarium it shows that Mars was only 11.2 arcseconds in diameter but it was also culminating at around 70deg altitude. I remember it was a reasonably cold night for mid-April but the seeing was just rock-steady for about an hour and a half and I used as much of that time as I could to enjoy the views.