Elizabeth maintained peace throughout an era of intense religious conflict allowing England to prosper. She presided over the emergence of England as a world power.
On this site she is Queen Elizabeth of England. Today's Queen Elizabeth is Queen Elizabeth of the United Kingdom, a non-existent entity in the 1500s. Today's Queen Elizabeth is Elizabeth I in Scotland.
An outstanding collection of images of Tudor era dress can be found here.
Elizabeth's Wikipedia article can be found here.

ca. 1563 Queen Elizabeth I "Hampden" portrait wearing Spanish farthingale by Steven van der Meule (private collection)

1563 Gripsholm portrait thought to be Elizabeth by ? (Gripsholm Slott - Strängnäs, Södermanland Sweden)

1575-1578 Elizabeth I attributed to Nicholas Hilliard (Fairhaven Collection, Angelsey Abbey - Cambridge UK)

1579 Plimpton sieve portrait of Queen Elizabeth by George Gower (Folger Shakespeare Library - Washington, DC USA)

ca. 1576 Elizabeth I playing the lute by Nicolas Hilliard (Berkeley Castle - Berkeley, Gloucestershire, UK)

ca. 1588 Portrait of Queen Elizabeth, a variation of the Armada portrait, by George Gower (Philip Mould)

Elisabeth Ière d’Angleterre by ? (Musée national et domaine du Château de Pau - Pau, Nouvelle-Aquitaine, France)

ca. 1590 Elizabeth I (1533–1603) by ? (Magdalen College, University of Oxford - Oxford, Oxfordshire, UK)

Queen Elizabeth I (1533–1603) by Lucas de Heere (Royal Borough of Windsor and Maidenhead, Civic Collection - Maidenhead, Berkshire UK)

1592 Elizabeth "Ditchley Portrait" by Marcus Gheerraerts the Younger (National Portrait Gallery - London UK)

1592 Queen Elizabeth I 1533-1603 with a fan by ? (Compton Verney Art Gallry, Compton Verney House - Compton Verney, Warwickshire, UK)

Color portrait by ? (National Portrait Gallery - London, UK) early 17th century with 18th century overpainting

ca. 1595 Queen Elizabeth portrait, Marcus Gheeraerts the Younger (Folgers Shakespeare Library - Washington, DC USA)

1596 Queen Elizabeth I (1533–1603) and the Cardinal and Theological Virtues by ? (Dover Collections - Dover UK)

1596 Elizabeth I by Crispyn de Passe the Elder (Yale University, Yale Center for British Art - New Haven, Connecticut, USA)

ca. 1599 Elizabeth I of England by Nicholas Hilliard studio (Hardwick Hall - Chesterfield, Derbyshire UK)

1600-1602 (some time in that span) Elizabeth I "Rainbow Portrait" attributed to either Isaac Oliver or Marcus Gheeraerts The Younger (Hatfield House - Hatfield, Hertfordshire, UK)

Queen Elizabeth I, in a richly embroidered and bejewelled red dress, holding an orb and sceptre by a follower of Federico Zuccaro (auctioned by Christie's)
