If I am not repeating keyword in alt tag, but giving a descriptive explanation, will that be considered as spamming BY GOOGLE. Regrards
yes,u can give alt tag acording to your image size,i mean to say is if your image is big than u can put 8-10 words,but it should not happen that your image covered bye alt tag.
Use a short description in the alt-text with a low number of words 1-4 should be enough. If you want to use a longer description then consider using the longdesc attribute. See W3C The actual image size has no part to play in this; it’s what the image represents that counts. These descriptions are to benefit the users that uses browsers with images disabled, not the search engines.
you are right mad4 If you were describing the content of the image why would Google consider that to be spamming?