3 added 792 characters in body
source | link

Differences circled:

Hover to spoil them.

(click to enlarge)

Warning: lots of freehand

enter image description here

Written Differences: (R-L on R image)

1. Stripes on the girls socks
2. Her Elbow doesn't have that little shading
3. The buttons are missing on the guy on the right (I had initially counted each of his buttons as their own difference)
4. Signature thingy on top of his head (guy on the right)
5. Rock? Shading? under the umbrella handle (yes at first it looks like an axe/pick, but if you look closely you'll see that it's an umbrella)
6+7. are the other 2 buttons (see #3)

The actual other 2, which I noticed after @NL628 posted their answer:
6. Guy on right is looking in the other direction
Girls shadow is different (lighter)

Differences circled:

Hover to spoil them.

(click to enlarge)

Warning: lots of freehand

enter image description here

Differences circled:

Hover to spoil them.

(click to enlarge)

Warning: lots of freehand

enter image description here

Written Differences: (R-L on R image)

1. Stripes on the girls socks
2. Her Elbow doesn't have that little shading
3. The buttons are missing on the guy on the right (I had initially counted each of his buttons as their own difference)
4. Signature thingy on top of his head (guy on the right)
5. Rock? Shading? under the umbrella handle (yes at first it looks like an axe/pick, but if you look closely you'll see that it's an umbrella)
6+7. are the other 2 buttons (see #3)

The actual other 2, which I noticed after @NL628 posted their answer:
6. Guy on right is looking in the other direction
Girls shadow is different (lighter)

2 added 33 characters in body
source | link

Differences circled:

Hover to spoil them.

(click to enlarge)

Warning: lots of freehand

enter image description here

Differences circled:

Hover to spoil them.

(click to enlarge)

enter image description here

Differences circled:

Hover to spoil them.

(click to enlarge)

Warning: lots of freehand

enter image description here

1
source | link

Differences circled:

Hover to spoil them.

(click to enlarge)

enter image description here