Hi @Anonymous ,
Do you want to see Hand cursor instead of Mouse arrow when hovering over the image?
Currently, within PowerApps, if you want to see Hand cursor instead of Mouse arrow when hovering over the image, I afraid that there is no way to achieve your needs.
If your image source is a URL Link (can access without authentication), I think the Html Text control could achieve your needs. Please take a try with the following workaround:

Set the Html Text property of the Html Text control to following:
"<img src='" & "https://c.pxhere.com/photos/f2/a8/squirrel_furry_animal_fluffy_brown_outdoor_small_curious-569161.jpg!d" & "' height='400' width='400' style='cursor:pointer' />"
Note: The cursor attribute in the <img> tag is used to specify the cursor style.
If the source image is not an URL Link, I agree with @KrishnaV 's thought almost. You could consider add a Button control over the image control, make the button over the image control properly. Clear the Text value within the Text property of the Button.
Set the Fill property and HoverFill property of the Button to following:
RGBA(0, 0, 0, 0)
Best regards,