Student or Learner
To tell someone that the payment was paid by cheque and there is the image attached in email.
Payment has been made via through cheque. Please check the attached image.
Is "attached image" or "attachment" image?
We don't say "via through cheque". We say "by cheque".
I wouldn't say "Please check the attached image". I would say "Please see the attached image". To simplify it even more, you can say "Payment has been made by cheque (image attached)."
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.
I agree- check sounds as if you're asking the person to look for something wrong with the image, at least in BrE.