url
https://getavataaars.com/?accessoriesType=Prescription01&avatarStyle=Circle&clotheColor=PastelOrange&clotheType=ShirtScoopNeck&eyeType=Close&eyebrowType=SadConcernedNatural&facialHairType=BeardMagestic&hairColor=Black&hatColor=Gray02&mouthType=Grimace&skinColor=Light&topType=ShortHairShortWaved

result of embed image tag button
<img src='https://avataaars.io/?avatarStyle=Circle&topType=ShortHairShortWaved&accessoriesType=Prescription01&hairColor=Black&facialHairType=BeardMagestic&facialHairColor=BrownDark&clotheType=ShirtScoopNeck&clotheColor=PastelOrange&eyeType=Close&eyebrowType=SadConcernedNatural&mouthType=Grimace&skinColor=Light'
/>

same as above, just rendered so you can get an idea.
img:

Problem

on the webiste I got this guy on random.
I clicked the embed image tag button and got this. in the search query you can clearly see it specifies the a failedHairType but it doesnt show that when rendering via image tag.

I suppose theres a casesensitivity issue or a spelling mistake somewhere in either the api or the getImageTag() function that returns the embeddle image tag.

wall_mask1 is wrong lines 1445 - 1449 at tops.dart
https://github.com/devslane/Avataar-Generator/blob/b994727ff7b93dabf5f5b0a1c4579ca027490908/lib/methods/tops.dart#L1445

#path1 must be #cloth_mask at clothes.dart
https://github.com/devslane/Avataar-Generator/blob/2904f6412f749664c74f281bb8d6ccb25c01c34c/lib/methods/clothes.dart#L42

Please consider to opt this package into null-safety.