e.g. Relevant pictures to Esperanto.
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Could you please elaborate a bit your question, e.g. add some examples for the uses you intend. This would help a lot especially to non-native speakers of English. – Cyril Robert Brosch Feb 8 '18 at 8:37
John Well’s dictionary has the following for relevant:
relevant (tiu)rilata, koncerna, tiutema, trafa, pria
So I think depending on the context any of these might be suitable. For example:
Mi kreas afiŝon pri nia loka klubo kaj mi serĉas bildojn rilatajn al Esperanto.
Mi volas diskonigi esperanton do mi desegnas tiutemajn bildojn.
I think your question lakes context. An other option might be taŭgaj bildoj, but it's difficult to give you a relevant answer without more context.