As I recall,
The C-150 cowling has a flat top while the C-152 os sloped.
C-150 has a Continental 0-200-A, 100 h.p, 1800 TBO and were built from 1959 to 1977. Early C-150's had manual flaps, straight tail, fastback (no back window), airspeed indicator in MPH instead of Knots. Several imporvements were made to the C-150 such as electric flaps. Some flap indicators were mounted on the left windscreen/door post. There are several other improvememnts which have been made through the various model years of the C-150.
The C-152 was made from 1978 to 1985. C-152 has a Lycomming 0-235 series engine which range from 106-110 H.P. depending which model year. The TBO is 2400 hours.
Both the C-150 and C-152 are excellent trainers and short hop airplanes. They are very tough and forgiving.