They turned out nice!
if you are dropping stitches, then it may of jumped a guide, re thread your machine..
some of the first things i check when my machine starts acting up, is
1.rethread
2.check the bobbin..(if the bobbin thread is getting real low, or not wound properly)
3.change the needle
4. remove the plate and clean out the bobbin area.
done in no real order, but those are the first things i do! good luck, and let us know how it goes for you!