I came across a nice butterfly tree painting and I am trying to learn as much about it as i can.
The signature and the seal are both "煥乎" (huàn hū) meaning "brilliant", possibly originating from The Analects "煥乎其有文章". The seal uses a non-standard form of the character 煥, replacing the radical 廾 (in seal script) with the 火 radical, effectively contracting the character.
After @dROOOze pointed it out, I took a closer look at the second character (on the left), and it should indeed be 平 (píng) instead of 乎. In that case, the word is probably not a classical allusion, but simply the name of the painter. In fact, I seem to have found another piece from the same painter on ebay, where the same seal is used. The listing confirms the name 焕平.