problema no se que hacer iceblue

hola a todos la verdad esque nuevo en esto estoy haciendo mi pagina pero tengo problemas con la foto de encabezado y unas rallas negras como puedo quitar las rayas negra y la foto no se que pixel poner me baje una plantilla y es esta

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estube localizando la foto para las medidas y ponia 921x250 pero lo hice y sale mal podeis mirarlo en mi agina construccionesmorata.es.tl
gracias de ante mano