Base picture size - 16535x16535px, 300dpi, 107MB 

Using Save As
1st picture - 1500 x 1500px, Quality 1, 216KB
2nd picture - 1500 x 1500px, Quality 2, 283KB
3rd picture - 1500 x 1500px, Quality 3, 314KB
4th picture - 1500 x 1500px, Quality 4, 372KB
5th picture - 1500 x 1500px, Quality 5, 446KB