On thinking, that picture has some sharp rocks. If Venus was covered in clouds of sulfuric acid, wouldn't you expect rocks to be more rounded?

Sulphuric acid is not a magic "dissolve everything in seconds" thing. And there is only 0.018% of SO2 in Venus atmosphere.

I mean, Russia can land multiple probes on Venus and take pictures, but the U.S. can't muster one?

US just have no interest in Venus. May be somebody told them, that it is a useless hell with 600°C and 90bar on surface?

Flight to Venus is easier in terms of fuel and time than flight to Mars. Also, in USSR there was no any beforehand knowledge about surface conditions of Venus, Soviet scientists suppose that Venus is covered with water, and first probes was even build with an ability to float in theoretical Venus ocean. So, USSR choose Venus as a target of first interplanetary missions. US choose Mars.

On thinking, that picture has some sharp rocks. If Venus was covered in clouds of sulfuric acid, wouldn't you expect rocks to be more rounded?

Sulphuric acid is not a magic "dissolve everything in seconds" thing. And there is only 0.018% of SO2 in Venus atmosphere.

I mean, Russia can land multiple probes on Venus and take pictures, but the U.S. can't muster one?

US just have no interest in Venus. May be somebody told them, that it is a useless hell with 600°C and 90bar on surface?

Flight to Venus is easier in terms of fuel and time than flight to Mars. Also, in USSR there was no any beforehand knowledge about surface conditions of Venus, Soviet scientists suppose that Venus is covered with water, and first probes was even build with an ability to float in theoretical Venus ocean. So, USSR choose Venus as a target of first interplanetary missions.