Hi Liciano,
My opinion is that this is the work of Timoth Parker.
He is an abstract painter and his work of "women's butts" is very unique?
Hope this helps!
Yes you are right...different signature...but similar "Butt"The "Timothy" signature is on the copy of Michel Delacroix's canal scene, not on the painting of the nude lady. This is the signature on that one:
View attachment 2121352