The Quran forbids worshipping paintings/statues, not making them!
Everything the Quran doesn’t forbid, is allowed, in principle (al-Maida  87).
“…Are you going to teach God about your religion?…” (al-Hujurat  16).
There’s no information in the Quran that paintings or statues are forbidden. The source of prohibition about paintings and statues in the Islamic culture is found in various narrations and traditional understanding, but not the Quran. Similarly, the notions that those who paint pictures would be the most likely to be punished on the day of resurrection, or that angels would not enter houses where paintings are, aren’t stated in the Quran.
To understand this matter in a correct way in the Quran, the word tamathil تَمَاث۪يلَ which means paintings or sculpture is very important.
“(İbrahim)…What are these statues (tamathil التَّمَاث۪يلُ ) to which you are devoted?…” (al-Anbiya  52).
“They made for him (Sulaiman) whatever he wished: sanctuaries, statues (tamathil تَمَاث۪يلَ ), bowls like pools, and heavy cauldrons…” (Saba  13).
Even the word tamathil تَمَاث۪يلَ (singular timthal) was used in al-Anbiya  52 as a term meaning idol, but the same word was used in Saba  13 as a statue, without worshipping it. In other words, every statue wasn’t used in the Quran as an idol. Therefore, the Quran mentioned the topic about paintings and statues and related that one of the Prophets was allowed to make statues. The Quran doesn’t say that paintings and statues are forbidden.
Even though there’s no prohibition about paintings and statues in the Quran, there are some principles which have to be followed, such as in music, art and entertainment:
The paintings or statues shouldn’t bear association to Allah (Shirk) (az-Zumar  65).
The work shouldn’t be shameful and disgraceful (an-Nahl  90).
The works shouldn’t include insulting and disrespecting content (Enam  108).
In conclusion, the result is, that the Quran forbids to worship paintings or statues, but doesn’t forbid making them.
The Byzantine currency, which is referred to with various names, is known in Arabic as Dinar (Denarius). The Prophet Muhammad used this Byzantine currency, in which reliefs of Emperor Heraclius (Ruling: 610-643) was used (Al Imran  75). However, these reliefs weren’t defined as an idol and weren’t forbidden by the Quran!