if it is alright to share, let’s build a listing of current and authentic web pages, which can be ready source of Islamic Art images and history.
Re: websites on Islamic Arts
This is an amazing site, it talks about the islamic art history, something you won’t find all that easily.
The Islamic art collection at the Los Angeles County Museum of Art, LACMA
This is another amazing one… it is sectioned into topics and timeline…
ART HISTORY RESOURCES ON THE WEB: Islamic Art
Nice thread dush baji! Will add more later. 
Re: websites on Islamic Arts
tagucci .com
Sorry this site isnt about the history of islamic art. Rather it is modern day contemporary islamic art. Angel Eyes suggested this site long ago. I'm in love with the pieces on this site but as expected theyre a bit pricey for me.
Then theres Haji Noor Deen.
hajinoordeen .com
This guy is an exceptional calligrapher, with works going for equally exceptional prices :(