Lossless compression

Wondering if if you can help on this compression the images below

TICKET INTO WPDEV FOR SMUSH

These dogs need to go small. Asking them about it.
Losslessly compressing https://stage0jsbg.wpengine.com/wp-content/uploads/2015/05/fret-levelilng-kit-header.jpg could save 4.6KiB (4% reduction). See optimized version.
Losslessly compressing https://stage0jsbg.wpengine.com/wp-content/uploads/2014/11/Dons-guitar-250x250.jpg could save 3.9KiB (13% reduction). See optimized version.
Losslessly compressing https://stage0jsbg.wpengine.com/wp-content/themes/childofadrenalin/images/transparent-seg.png could save 2.6KiB (96% reduction). See optimized version.
Losslessly compressing https://stage0jsbg.wpengine.com/wp-content/uploads/2015/04/productsImg3-250x250.jpg could save 1.7KiB (8% reduction). See optimized version.
Losslessly compressing https://stage0jsbg.wpengine.com/wp-content/uploads/2015/04/guitarImg15-250x250.jpg could save 1.6KiB (7% reduction). See optimized version.
Losslessly compressing https://stage0jsbg.wpengine.com/wp-content/uploads/2016/04/Fine-Handrafted-Custom-Guitars-J.S.-Bogdanovich-Guitars.jpg could save 1.1KiB (2% reduction). See optimized version.
Losslessly compressing https://stage0jsbg.wpengine.com/wp-content/uploads/lecture-250x250.jpg could save 907B (4% reduction). See optimized version.
Losslessly compressing https://stage0jsbg.wpengine.com/wp-content/themes/adrenalin/images/icons/star-on-retina.png could save 890B (36% reduction). See optimized version.
Losslessly compressing https://stage0jsbg.wpengine.com/wp-content/themes/adrenalin/images/icons/star-off-retina.png could save 741B (50% reduction). See optimized version.
Losslessly compressing https://stage0jsbg.wpengine.com/wp-content/themes/childofadrenalin/images/popup_close.png could save 622B (42% reduction). See optimized version.