Currently, I have 4 foreign bridal candidates and some English ones.
Dorothea of Denmark, b. 1520, daughter of King Christian II of Denmark and Norway & Isabella of Burgundy. OTL wed Frederick of the Palatine 1535.
Eleanora d'Este, b. 1515, daughter of Lucrezia Borgia (daughter of Pope Alexander IV) and Alfonso I d'Este, Duke of Ferrera. OTL nun.
Maria of Portugal, b. 1521, daughter of King Manuel I of Portugal & Eleanor of Austria. OTL never wed.
Margaret of France, b. 1523 (yes, I know we'll have to wait a bit for her), daughter of King Francis I of France and Queen Claude. OTL wed Duke of Savoy in 1559.
The English Roses:
Jane Seymour, b. 1508...OTL, you know her story
Catherine Willoughby, b. 1519, OTL she was betrothed to the sickly Earl of Lincoln and wed Charles Brandon in September 1533.
Mary Howard, b. 1519, OTL she wed Henry VIII's bastard son Henry Fitzroy and never remarried after his death.
and a trio of sisters - Philippa (b. 1516), Katherine (b. 1517), and Anne (b. 1521) Basset. OTL, Philippa is little known, while Katherine & Anne were promoted as ladies in waiting for Queens Jane & Anne & (I believe) Catherine Howard.
Anyone else?