That looks like plenty of color to me, though it is entirely up to the discretion of the particular judge.
Some years ago I had a Satin junior buck that had less color than yours (smaller side markings and no spine marking at all) and he won at least 2 GC legs before he left for another barn. (He was not a charlie, in spite of his few markings.) At that time, though, the Satin breed standard faulted, but did not disqualify, for less than 10% color, and there was no general disqualification, like there is now.
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But that was back when judges seemed to take the "less than 10%/more than 50%" rubric pretty seriously. Now most are moving to a more honestly subjective (IMO) judgment that the rabbit should not look like a charlie or a booted.