能否将此段英文帮我翻译一下“ Do be careful though when you crop the images to tight it Can take away from the subject and it is always recommended that your subject face never be cut off unless it seves a purpose. There is also the issue of noise in your pictures it is a common problem with taking digital photographs. It can be cause by having the wrong ISO Setting or if you are zooming into your images to much. Do you do a lot of zomming in from the original image”。

我认识的一位朋友的朋友是学过摄影的，他就把我近来出游时拍的那几张人物特写图片转给他看了看， 她回的email里的这句话我就弄不太明白是啥意思？