[Export for instagram]

Guys, im tryin to post some job on instagram, but it keeps lookin like shit, dont know why, i have tried png, jpeg and nothing

its a 1080x1080 150dpi

When i see the post on my pc, its all good (not that good, its just more ok, but not GREAT) but when i look on my cellphone, it looks like crap, and is not only on my smartphone, i send to my friend and it he saw the mess, dont know what to do, i will send a pic of what i saw on pc, a little blurry, but its better than the cell one, i cant show u guys cuz when i see on pc it changes i will describe, its like the bright colors its exploding, my friend said that looks like its a tiny image