Bobby,
I think you did a good job. I like the profile of the blanks, they fit the components well.
Now for critique, it looks like you turned the nib just a little proud of the bushings. It looks like the nib actually cuts into the wood. Here is a tip for you if this is the case. Once you have the blanks on the lathe and turned close to the size of the bushings, take the blanks off, especially the end where the nib will be. Now check to make sure that the blanks was faced squarely with the tube, maybe even take a piece of sandpaper 400 grit, lay it on the bed of the lathe and sand the blank until you are sure you are even with the tube. I think you may not have turned the blank flush with the bushing and I think you may have not been square with the tube.
Second critique, I see a scratch around the barrel just below the center band. You should have cleaned this up a little more with the skew. Here is another tip: When you have the barrels turned to size, remove the larger bushings and put on the smaller slim bushing to complete your final sanding and finishing. I think the bushing got in your way from getting everything sanded and finished evenly.
As far as a really nice finish using CA and BLO, there are a lot of variables. Cocobola is and oily wood and is very hard to get a really nice finish especially when you are on pen #7. Read everything you can on finishing and practice, practice and practice.