Well in my opinion you did very well! I like the brightness and color that you brought to the character which I felt like she was lacking in Sonic Adventure, the use of color can really show a characters mood and personality. I also like the fact you stayed relativity to the old style of her, the design Sega went for her fits her back story and role as Princess of her tribe.
However, I do feel like the presence of time was not at all Incorporated in this. Tikal was presumably inscribed into the chaos emerald along with Chaos for 7-10 years (Enough time for the other characters to change there personality and looks), there should be some form of aging in her, such as lipstick, subtle changes to the outfit etc. to show that she had undergone some changes when she was in the emerald.
Other then that you can see the direction you were going in this, but a more accurate depiction would be your 2011 version.
ESPLÉNDIDA, HERMOSA, IMPRESIONANTE, RESPLANDECIENTE, AMISTOSA ,SENSACIONAL, COLORIDA Y ACTUAL!ES LA MÁS PARECIDA A LA VERDADERA TIKAL QUE HICISTE!ESPERO QUE ALGÚN DÍA VUELVA A LOS JUEGOS ESTANDO PRESENTE EN LOS JUEGOS EN EL MODO HISTORIA!