with https://letsenhance.io/
So small JPG --> big PNG result --> save as JPG for more reasonnable size for load on a forum ;)
(730 KB (JPG) --> 114 Megas (PNG)--> 15 Megas (JPG)

2048 * 1706 --> 8192 * 6824

Second image same but starting with a PNG (so no lose information like JPG)
(6 Megas (PNG) --> 114 Megas (PNG)--> 15 Megas (JPG)



Second image