I love this quilt, can't believe that this is your 1st quilt! Yes, make it bigger. Take it to the fabric store and audition some fabrics next to it and add what you like.
Look up other patchwork quilts on the web to get ideas.
Your quilts will be fine if you square up your blocks and sew a careful 1/4 inch seam, looks like that is what you did. You are doing great!
From another Florida quilter, from Tarpon.