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Mexico
Painting by Luis Nishizawa
October 9, 1998
The stamp shows the painting and signature of Luis Nishizawa (1918-2014), a Mexican artist known for his landscape work and murals.

Montenegro
Historical Heritage
November 17, 2020
Set of two, one stamp shows the portrait and signature of Princess Xenia of Montenegro (1881-1960).

Belgium
250th Anniversary of Birth of Mozart
January 21, 2006
The design includes a profile, sheet music, and signature of Wolfgang Amadeus Mozart.

This 50 centimo stamp (Sc #581) from Spain's 1936-8 definitive series depicts Spanish Baroque painter Diego Velasquez (1599-1660). The pose on the stamp is very similar to the one (shown here) on a detail/close-up view of a 1643 self portrait by the artist.

From wikipedia, "Diego Rodriguez de Silva y Velasquez was the leading artist in the court of King Philip IV and of the Spanish Golden Age."

Bet that collar was compfy.

Here is the USA's May 13, 2008, 42c commemorative featuring American singer Frank Sinatra 1915-98). Sometimes "Sinatra" was signed in one part, as on the stamp, and other times there was a break; it was in two parts.

On February 11, 2006 Lithuania issued this set of three Famous Lithuanians stamps (Sc #s 805-7).

Adolfus Sapoka (1906-1961) historian
Petras Rimsa (1881-1961) sculptor
Antanas Vaiciulaitus (1906-1992) writer

Here is Latvia's November 7, 2014, 0.64 euro stamp featuring graphic artist Peter Upitis. Upitis worked in miniature, and is known mostly for his bookplates.

Latvia issued this 15 santims stamp (Sc #352) on September 8, 1993 to commemorate the visit of Pope John Paul II (Karol Jozef Wojtyla) to the country. This Pope's signature can appear in several different forms. This one is in his native Polish.

This May 17, 1962 twenty pfennig stamp (Mi #890) is the high value of a two-stamp set issued by the DDR to commemorate the birth bicentenary of philosopher Johann Gottlieb Fichte (1762-1814).

Colombia
Famous Colombians
February 24, 2021
Set of six, one stamp depicts portrait and signature of Fernando González Ochoa (1895-1964), a Colombian author and philosopher.

On September 12, 1996 Germany issued this 400 pf stamp (Mi #1880) to commemorate the bicentenary of homeopathy. Stamp depicts a silhouette profile of Samuel Hahnemann and his signature.

From wikipedia, "Christian Friedrich Samuel Hahnemann (1755 - 1843) was a German physician, best known for creating the pseudoscientific system of alternative medicine called homeopathy."

Here is the Federal Republic of Germany's (BRD) February 14, 1979 stamp (Mi #1001) commemorating the birth centenary of poet and journalist Agnes Miegel ( 1879-1964).

This April 19, 1884 3.50 kr stamp (Facit #1198) of Norway is the lower value of a two-stamp set commemorating the bicentenary of the town of Tromso. Stamp depicts a decree and signature of King Christian VII of Denmark-Norway giving Tromso the status of town. This was done to make the regulation of trade with Pomor (Russia) easier.

Second pic shows oil portrait of Christian VII (1749-1808) as he appeared in 1772 (age 23) by Swedish artist Alexander Rosan. Christian VII reigned as king only nominally, due to mental illness.

On April 23, 1958 the DDR issued a two-stamp set commemorating the 100th birthday of Nobel Prize winning g physicist Max Planck (1858-1947). The 10 (pf) value (Mi #626) of the set, shown here, depicts a small, script "h", the symbol representing physical quantum effect, and Planck's signature.

A later stamp of Germany containing Max Planck's signature, and commemorating his 150th birthday, is shown on page 6 of this thread.