Asalamu Alaikum,
Bro, everyone goes through ups & downs in their level of faith.
Everyone gets lazy and not always pray on time. Of course this is a shataan doing... but the solution is will power.
You should attend lectures and listen to Quran... frequently recite surahs yourself... fast if you have to... have a whole big iftar... whatever it takes to get you motivated about religion again.
Another advice is... find a religious brother and compete to do good deeds with him.. this will raise your level of Imaan and thereby make you "unlazy" to pray salaah.
Different approach than that is of terror. Read up on the torture of the grave... the punishment of the hereafter and torments on the day of ressurrection...
If all fails... I suggest you go to the graveyard and ponder your death.
Salaah is very important... one of the first things Allah will ask you on judgement day. If your salaah is good.. your deeds are good.
Secondly, I noted you said you have pictures in your bedroom and thats why you cant pray there...
There is an authentic hadith which states that the angel Gabriel couldn't enter the house of the prophet just because he had a dog and garment with pictures on it.
So do you not want the angels in your house? I suggest you get rid of them... Once the angels start coming in your house... you wont have shataans in your house whispering you to miss your salaah. As angels dont come where the shataans are... so you see what you have to do to solve this problem?
May Allah make it easy for you and increase you in Imaan.
W'salaamz,
Hamid