You sound correct when you say "papas". I recomend to you to compare with "papá" pronunciation.
As you might know "papa" (potato) and "papá" (dad) sound very similar, so it would be a good exorcise for you.
(PD: Remember "papa" is the same for both "potato" and "pope", so you can also practice with "pope" meaning too haha)
On the other hand, i notice you "r" sound between vocals (soft sound) its little hard for you. Specificly when you say "era" you sound like "erra", so this might be someting to correct. But the rest is very good.