let me give u tips, if you want to put title/text on full image(colorful background), u need some feature like glow or stroke since they might mixed with background pic made the text difficult to read
about font, u need some easy to read text (dont aim beauty or cool font, most of em difficult to read) most of used font on signature are types of sans serif fonts
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example on my signature is text that placed on empty place to increase attention and readable of text