i think you have reached you limit on here ali,
try to delete old pics from ages ago and youll get back space.
but like you said host it on Bucket then just embed the image [img] piccy url in here [img/] and its going to look the same.
quick compress utility is on Windows picture manager/veiwer standard, just click image, tools, compress, select mail, web, word or what ever the 3 size choices are and boomm shanka !