The main thing with illusion knitting is to have the stitches a bit tighter than you might normally. Also if the yarn is fuzzy, it won't show up as well. The weights of the yarn has to be the same, too.
If yours meets all these criteria, then give it some more time.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry