What i suggest doing is find your pic. then right click and open in paint. (if your on a mac ur screwed T.T"
then once its open go to save as. in a drop down menu select save as .jpg it should be .bmp by default. this will convert it to a jpeg and reduce the file size to an upload-able level.
Bands: plain white t's, Boys Like Girls
A JPEG image is a compressed image format, alike PNG (Portable Networks Graphics), BMP (Bitmap), TIFF (raw image) and RAW (raw image) (omitting some formats to conserve length); JPEG is excellent for photos, but in linear SC's, it creates pixellation and what may sometimes be referred to as "color blending," which may uglify screenshots. I recommend PNG for small size and high quality retention.