No worries. Yes, the Altmer are rather tall, so it wouldn't make much sense for them to look voluptuous. Long, lean and slender are the ways forward here. You might want to look at women like Blake Lively or Famke Janssen; while they're not ridiculously tall, they are taller than most, and a good point of reference for female Altmer.
I prefer working with the Imperials, but the other races all have their benefits. The Bretons were modelled after the French, and while it's certainly not a perfect translation and it would be unfair and highly prejudice to say that all people from a certain place look the same, it is worth taking note that they made them in their image; so if you're a fan of women like Eva Green, Sophie Marceau or Mélanie Laurent; you might want to consider rolling a Breton.
Nords on the other hand, being Nordic inspirations of course; are based off of Scandinavians or people of Northern Europe; that have pronounced facial features and strong jawlines, unlike the softer Bretons. Some examples might include women like Malin Akerman from Watchmen, Olga Kurylenko, Izabella Scorupco or Mila Kunis (while I'm swooping a little further into Central Europe there, she still has a lot of strong facial features)
Moving onto the Redguard, who are somewhat a mystery to me; as a lot of their culture implicates Arabian or Arabic inspirations; though the people themselves appear to look more Saharan than anything else, but again, their names would suggest Turkish, Arabic or North African (Amir, Azani, Isran, Nazeem, Nazir, Shadr and Zaria). We're not here to talk about their cultural inspirations however, we're here to look a the physical appearance of their women, and find some suitable examples for you to consider. This one is extremely hard for me, as it seems even the developers struggle here to make up their minds which direction they are taking the Redguard, but here goes. I sat there looking at my female Redguard and asked myself which actresses came to mind; and the ones that popped into my head were Zoe Saldana, Gabrielle Monique Union, Kerry Washington, Rosario Dawson and Gina Torres (for you Firefly fans out there). Have fun.
I can't really comment on Argonians, Khajiit or the races of mer; so I'll finish up with my personal favourite, the Imperials. When you think Imperials, you think of the Roman Empire, which was their clear inspiration here; and though the name itself is a bit of a misnomer, they have done something rather clever here. You see, the Roman Empire wasn't made up of one people or culture, it was made up of many different types of people and cultures; they expanded their borders so far and wide that it's really impossible to find a universal example. The same goes for the Imperials in Tamriel; a lot of them moved around a lot and came from many different backgrounds. If I had to sum the Imperials up in one word, it would be diverse.
With all that in mind, there are clear things that come to mind when you think of a typical Roman; or Imperial as it is; they're tanned, dark haired and in a word; exotic. Make of that what you will, but I'm compiling my list based on that word alone; exotic women. In my opinion, the ideal inspirations for a good looking Imperial would be Alessandra Ambrosio, Monica Bellucci, Penélope Cruz, Elsa Pataky, Eva Mendes and Salma Hayek.
I hope these ideas inspire some people, but if they don't, it was fun putting together anyway. Thanks for reading and good-luck making your character!