You can not increase, just select the same signature, that were in the figures. This is not what you asked for.
Fortunately, almost calligraphic signatures derived so-called kurrentshriftom (gothic cursive). Handwriting and drawing style are the same. In the first picture reads "E. Engel", the bottom "19 ..". The second - "Ostern 1904" (which means "Easter 1904") and below "Ebbi": a diminutive version of the name "Eberhard". So "E. Engel", apparently, should read as "Eberhard Engel" - Eberhard Engel. But, alas, an artist found in the network fails. Obviously, he is little known, as might be guessed from the drawings. The first drawing is clearly a failure and, in my opinion, unsaleable, and the second, however, is better, but not more than 10 - 15 euros.
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