Just save the file in Photoshop in "File/Save as..." choose a name and click "Save". Now a new window in with the compression options should appear. Move the quality slider towards "large file" (Quality: 12). Leave the format as "Baseline (Standard)" and hit OK.
That's the highest quality JPEG file Photoshop can output.
I have tried soo many time to upload the images, but i was not successful. I get reply as this is not exactly what we are looking for. But I have seen similar type of images been uploaded and been sold. Not sure why my images are not been selected. I do images of size 2000X1500 in photoshop and save it as jpg file baseline max. resolution