Imagemagick compose two images

convert pdf into png

convert -density 300 -depth 8 -rotate -90 -quality 85 test.pdf test.png  

compose an inlet into an background:
while resizing the inlet by 15% in both directions
and shifting the inlet by +700 +0

composite -verbose -geometry 15%x15%+700+00 inset.png background.png test.png