I'm guessing from the use of the term "anal-retentive" ("A person characterized as anal retentive is perceived to be worrying too much about "nit-picking" little details...," that this person feels that pointing out details like the size of the sculls or the angle of the chains is picking on minutiae that they don't consider important to their work. Of course, that doesn't excuse the rather rude response they gave you. Some people may appreciate knowing that you think if Vicky were really hefting a sword that big, her bicep would look different, others may not. Some people are probably more receptive to detailed technical criticism, others may see that as nit-picking. Some, as has been said, really don't want anything negative at all. The problem is, there is no way to tell what any one individual wants or feels comfortable with. They check the box and take their chances, you leave your comments and take your chances. You may know what your best friend want's to hear when she asks "does these pants make my ass look big?" Here, it's a crapshoot.

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken