Cosmos Cardigan part 2

So, after a few days of knitting, and 3 balls of yarn, I have reached the magic row 51, and divided for sleeves. This involves knitting across the front, putting sleeve stitches on a separate holder ( in this case, a cable from my Denise set), casting on 10 sts under the arms, knitting across the back, putting other sleeve on holder, casting on 10 sts under the other arm, and knitting across the other front. I'm pleased with how this is coming along, and I'm glad I chose this type of construction, as the gauge changed as I knit. Now I'm at about 6 rows per inch and 4.5 stitches per inch.Knitting in aggregate sometimes differs from swatch gauge, and luckily, I can try this on to check as I go. Here is the back view:

I'm liking this a lot. I think I will put a single vertical buttonhole in the front, so I can use a large decorative single button for a simple closure. And the 4-stitch purl column will allow some tapering in the back for the waist shaping further down.

Now the questions are: Short, long or medium length sleeves? And, cropped, long, shaped, peplum or what kind of body? I have a lot of yarn, and so I have a chance to play around with the design, according to what this sweater wants to become. I think I'll taper down to the waistline, and see how it goes from there.

Sometimes I like to knit about 4 inches on the body and then do sleeves, so I can get a better sense of how the sweater will hang, so that is probably what I will do.