I like the colors, contrast and general look of the card. Have you tried making the "highlighter" less perfect? I think it would look more hand drawn if they weren't so straight and maybe did not have such sharp edges; I am only suggesting a slight change to the highlighter marks. Too drastic of a change will compete with the rest of your design.
On a side note, I don't get the icon for logo design. It kind of looks like a peanut.
Just my two cents. Good job!