do what?

quality adjustment:
saving it as a more bit based image will give better results. such as a full out max settings 800+ colors png will look cleaner and more professional than a 128bit jpg :\.

you can manually make better quality images in photoshop through either vectorizing the image using pentool or other techniques such as selected filter cutouts or poster edges or even the mainstream filter of topaz clean. all convenient methods but imo vectoring the parts that look low qual will always look better imho. you could also blur areas and sharpen others etc etc

emphasizing the cyan:
make more of it. make it more vibrant. make it the focal point. never make it a filler. never make it a distraction from the focal. never pixelate it (shown on ur sig to the left as it does zigzags)