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A few comments based on a quick read of the paper...
1) I would include a diagram or photo of the tooth showing exactly where the imaged enamel regions were located.
2) How was the imaged specimen assigned to taxon? General morphology? Presence of enough other skeletal material to be confident of ID? If it is a shed crown, how do you know it is not just from something that scavenged the skeletal material?
3) The results / discussion really should include more in-depth comparisons with previously published work on amniote enamel microstructure. What phylogenetic implications are there, if any? For the functional implications, are there any comparative observations for extant taxa with similar diets?