starting to paper piece you waste alot of fabric...the first attempt i made i cut off so much fabric i was very frustrated...didn't like the waste...didn't try it again for a couple years...but it got easier, and less wasteful as i got the hang of it...to start though...you need to use large pieces of fabric...the 1/4" ruler really helps (you fold the paper on the stitching line...line up the ruler and trim perfect 1/4" then you have a line to line up the next piece.
your block looks pretty good, i see where your problem is and just use really over sized pieces until you get the hang of those angles...as you do each successive block it will be easier and easier and you will not waste so much...and really...doesn't have to be a waste...put those trimmings into a basket and use them for applique projects...or pass them on to someone who would love to be creative with them :thumbup: