In 1798 he was relieved from his job as a carpenter and probably started studying architecture at the Royal Swedish Academy of Arts the same year.
[2] After his studies he returned to Karlskrona in 1802 and re-entered military service, as adjutant to his former benefactor Jonas Lidströmer.
In Saint Petersburg he came in contact with the vibrant Neoclassical architectural scene there, and made several watercolours of the city.
[1] Back in Sweden, Blom was promoted and continued doing both practical construction works for the military and other architectural commissions.
The following years he produced his most prestigious and well-known designs, e.g. Skeppsholmskyrkan church and Rosendal Palace, both in the capital city, Stockholm.