There is an excellent tutorial on Anne Stradal's blog this morning (The Cape Stitcher) on choosing threads and stitches for needlepoint projects. The artwork, as usual, is charming - and her canvas preparation is great, as she stitch paints with great care. Anne believes, as I do, that the design should be dealt with as a whole, rather than as individual parts. Too much textural interest will distract and suffocate rather than enhance.
P.S. also please notice that the circle is drawn perfectly symmetric - this not only makes the canvas look nice, but it's easier to stitch neatly. Just drawing around a glass or whatever may look O.K. before the design is stitched, but it's not good canvas preparation, as the circle usually appears a bit or a lot lopsided after it's worked, and is difficult to finish as a round ornament.