If I were you I would breed from these two. Showing them is also a great idea and I would definitely recommend it. It is very helpful to talk to the judge once the judging is finished. Ask him or her to talk to you about your birds and to show you their strengths and weaknesses. You will get a lot of great feedback this way that will help you in your breeding. Judges are usually extremely happy to be asked to talk about your birds with you. Just listen politely, ask questions and take it all as a learning experience. You do it to learn and to show off the breed.
Here are a few of my own thoughts
Type (shape and size): They look to be a good size (not too small) which is a plus. It'd be nice if they were a bit deeper in the body - a bit more 'stocky' looking, rather than long and lean. Heads are not too bad - bills could be a bit less sloped down. You don't want anything that reminds you of a Runner head. They are not standing too upright, which is good. When they stand they shouldn't be parallel with the ground but not too upright either - about an angle of 20 degrees between the ground and the underside. They looks fine to me in this respect.
Colour: A nice, even, rich blue. Not too much black, which is good.
Markings: Having two white primaries is better then good - it's excellent! This is a big plus
I wish i had the same in my birds. Bibs are obviously broken (blotchy) and go up the neck a bit too far. But the bibs don't go too far underneath the body which is good. A little white on the face in the drake which is not ideal but it is not alot and your duck looks better as far as this goes (they are better than some of mine). Overall, the bibs could be a lot worse and I would not be put off breeding with them just because of the bibs. They may still produce offspring with neat bibs. I have a drake with a bib that is not much better and I will be using him in breeding.
Overall, you should breed with these two but I personally would also be looking to bring in some unrelated Swedish (maybe a couple more ducks - blue or black) that are deeper in the body and also have some number of white primaries. Go for good type in the birds you buy next - solid birds with deeper bodies and more rounded heads. I assume that these two birds are related and maybe from the same hatch so that also makes it important to bring in other birds (in my opinion). Inbreeding can preserve strengths (like the two white flights) but can also perpetuate weaknesses (in appearance and health). Anyway, all the above is just my opinion and I'm sure that other people will be happy to share their views too
I hope these two produce some nice babies for you
