@Jewels you've used the Title Image option to show your picture. There's little flexibility in using that option. The only advantage in using Title Image is that it would show at the top of each page of the topic if the topic goes beyond one page.
I assume that you've got the image on your computer/device.
As you have a VIP you can use Add Attachments (bottom right of the Create/Edit Topic box or the Add Reply box. You can upload an image from your device and use the option to show it in the posting part of the topic/reply.
Once it's showing in the posting box, you can select that image, look for Insert/load image in the row of icons above, click on that icon and you can see the dimensions of the image which you can change to the size you want (I wouldn't exceed a width of 800 in the display).
Hope that helps