What I do to get them less wonky (some of them have a mind of there own),
the first picture, measure a 1/4" from the point on the bottom blue piece,(closest to your seam ripper), marking in from right to left. Align the top tan triangle to match the mark, just the way it looks, and then pin carefully, middle, right, left. Another way would be to cut off the 1/4"tail on the blue piece, and line the tan piece up with the cut. I hope this makes sense.