I used to do that for fun, than I realized that it helped me with my english, specially conversation.
Begin thinkin in english, that will help, cause when u think u create a relation between the action, objetc or whatever with the word itself, than u might release ur english from ur portuguese, so, u won't need portuguese to know english, just the image, objetc or whatever...
I learned english in a school that thought me that way...
Other, with u find a word u do not know DO NOT search for translation, search for the meaning IN ENGLISH.
Good luck