I am at a stopping point with this so I can consider/reconsider the value shifts on this one so thought I'd do another WIP of it. After making a few adjustments (mainly at the lower left quadrant) I will remove all the masking and start modeling all those (gasp) sticker clumps. Then I will scratch out the biggest of the thorns that come from the fruit and sides of the cactus pads. If anyone sees anything bothersome at this point, that can't be assumed to be fixed next, please holler!
What I like so far is the extreme sunshine-y look to it, as all cactus should have. Goodness knows this cactus gets enough sunshine!